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When it comes to bibliography management in LaTeX, the package natbib is a package for customising citations (especially author-year citation schemes) when using BibTeX. This article explains how to use natbib to format and cite bibliographic sources. Note: If you are starting from scratch it's recommended to use biblatex since that package provides localization in several languages, it's actively developed and makes bibliography management easier and more flexible. Note, though, that most journals still use bibtex and natbib. Contents 1 Introduction 2 Basic usage 3 The bibliography file 4 Adding the bibliography in the table of contents 5 Reference guide 6 Further reading  Introduction A minimal working example is presented below: \documentclass{article} \usepackage[utf8]{inputenc} \usepackage[english]{babel}   \usepackage{natbib} \bibliographystyle{unsrtnat}   \title{Bibliography management: \texttt{natbib} package} \author{Share\LaTeX} \date { }   \begin{document}   \maketitle   This document is an example of \texttt{natbib} package using in bibliography management. Three items are cited: \textit{The \LaTeX\ Companion} book \cite{latexcompanion}, the Einstein journal paper \cite{einstein}, and the Donald Knuth's website \cite{knuthwebsite}. The \LaTeX\ related items are \cite{latexcompanion,knuthwebsite}.   \medskip   \bibliography{sample}   \end{document} In this example there are four basic commands to manage the bibliography: usepackage{natbib} Imports the package natbib. \bibliographystyle{unsrtnat} Sets the bibliography style unsrtnat. See the article about bibliography styles for more information. \cite{labelcompanion} Prints a reference to the citation entry, what is printed depends on the citation style. The word inside the braces corresponds to a particular entry in the bibliography file. bibliography{sample} Imports the file sample.bib that contains bibliography sources. See the bibliography file section.   Open an example of the natbib package in Overleaf  Basic usage A simple working example was shown at the introduction, there are more bibliography-related commands available. \documentclass{article} \usepackage[utf8]{inputenc} \usepackage[english]{babel}   \usepackage[square,numbers]{natbib} \bibliographystyle{abbrvnat}   \title{Bibliography management: \texttt{natbib} package} \author{Share\LaTeX} \date { }   \begin{document}   \maketitle   This document is an example of \texttt{natbib} package using in bibliography management. Three items are cited: \textit{The \LaTeX\ Companion} book \cite{latexcompanion}, the Einstein journal paper \citet{einstein}, and the Donald Knuth's website \cite{knuthwebsite}. The \LaTeX\ related items are \cite{latexcompanion,knuthwebsite}.   \medskip   \bibliography{sample}   \end{document} There are a few changes in this example: The options square and numbers in \usepackage[square,numbers]{natbib} enable squared brackets and numeric citations respectively. See the reference guide for a list of package options The styles abbrvnat is used here, see bibliography styles The command \citet adds the name of the author to the citation mark, regardless of the citation style.   Open an example of the natbib package in Overleaf  The bibliography file The bibliography files must have the standard bibtex syntax and the extension .bib. They contain a list of bibliography sources and several fields with information about each entry. @article{einstein, author = "Albert Einstein", title = "{Zur Elektrodynamik bewegter K{\"o}rper}. ({German}) [{On} the electrodynamics of moving bodies]", journal = "Annalen der Physik", volume = "322", number = "10", pages = "891--921", year = "1905", DOI = "http://dx.doi.org/10.1002/andp.19053221004" }   @book{latexcompanion, author = "Michel Goossens and Frank Mittelbach and Alexander Samarin", title = "The \LaTeX\ Companion", year = "1993", publisher = "Addison-Wesley", address = "Reading, Massachusetts" }   @misc{knuthwebsite, author = "Donald Knuth", title = "Knuth: Computers and Typesetting", url = "http://www-cs-faculty.stanford.edu/\~{}uno/abcde.html" } This file contains records in a special format, for instance, the first bibliographic reference is defined by: @article{...} This is the first line of a record entry, @article tells BibTeX that the information stored here is about an article. The information about this entry is enclosed within braces. Besides the entry types shown in the example (article, book and misc there are a lot more, see the reference guide. einstein The label einstein is assigned to this entry, is a unique identifier that can be used to refer this article within the document. author = "Albert Einstein", This is the first field in the bibliography entry, indicates that the author of this article is Albert Einstein. Several comma-separated fields can be added using the same syntax key = value, for instance: title, pages, year, URL, etc. See the reference guide for a list of possible fields. The information in this file can later be printed and referenced within a LaTeX document, as shown in the previous sections, with the command \bibliography{sample . Not all the information in the .bib file will be displayed, it depends on the bibliography style set in the document.   Open an example of the natbib package in Overleaf  Adding the bibliography in the table of contents If you want the bibliography to be included in the table of contents, importing the package tocbibind in the preamble will do the trick: \documentclass[a4paper,10pt]{article} \usepackage[utf8]{inputenc} \usepackage[english]{babel}   \usepackage[nottoc]{tocbibind}   \begin{document}   \tableofcontents   \section{First Section} This document ...   \bibliographystyle{unsrt} \bibliography{sample}   \end{document} Adding the line \usepackage[nottoc]{tocbibind} to the preamble will print the "References" or "Bibliography" in the table of contents, depending on the document type. Be careful, it will also add other elements like the Index, Glossary and list of Listings to the table of contents. For more information see the tocbibind package documentation.   Open an example of the natbib package in Overleaf  Reference guide natbib package options round for round parentheses square uses square brackets curly curly braces angle angle braces or chevrons semicolon separates multiple citations with semicolons colon same as semicolon comma separate multiple citations with commas authoryear for author-year citations numbers for numerical citations super superscripts for numerical citations, as in Nature sort orders multiple citations according to the list of references sort&compress same as sort but multiple numerical citations are compressed if possible compress compress without sorting longnamefirst the full name of the author will appear in the first citation of any reference sectionbib To be used with the package chapterbib to add the bibliography to the table of contents as a unnumbered section instead of an unnumbered chapter nonamebreak prevents hyphenation of author names elide to omit common elements of merged references Standard entry types article Article from a magazine or journal book A published book booklet A work that is printed but has no publisher or sponsoring institution conference An article in a conference proceedings inbook A part of a book (section, chapter and so on) incollection A part of a book having its own title inproceedings An article in a conference proceedings manual Technical documentation mastersthesis A Master's thesis misc Something that doesn't fit in any other type phdthesis A PhD thesis proceedings The same as conference techreport Report published by an institution unpublished Document not formally published, with author and title Most common fields used in BibTeX address annote author booktitle chaper crossref edition editor institution journal key month note number organization pages publisher school series title type volume year URL ISBN ISSN LCCN abstract keywords price copyright language contents  Further reading For more information see Natbib bibliography styles Natbib citation styles Bibliography management with biblatex Bibliography management with bibtex natbib documentation at CTAN web site tocbind package documentation International language support Table of contents