Use natbib for author-year and numerical citations in BibTeX-based LaTeX projects.
Use natbib when legacy BibTeX workflows or journal templates require it.
Basic Setup
natbib-basic.tex
\documentclass{article}\usepackage[authoryear,round]{natbib}\begin{document}\citet{smith2024} reports a strong baseline.Replications confirm this \citep{lee2025,nguyen2025}.\bibliographystyle{plainnat}\bibliography{references}\end{document}
Commands
\citet{key} textual citation.
\citep{key} parenthetical citation.
\citeauthor{key} and \citeyear{key} for split control.