Bibliography style latex apa

\documentclass[a4paper,10pt]{article} natbib \begin{document} This is an example of a paragraph with in-text citations using the apa BibTeX style. Here is a reference to a journal article with a single author \cite{article1}, to a journal article with two authors \cite{article2} and three authors \cite{article3}, and to a book with four authors \cite{book4}.

\bibliographystyle{apa} \bibliography{sampleBibFile} \end{document}