\documentclass[12pt,a4paper]{article}
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\usepackage{ppz}
\usepackage{psfig}
\usepackage{subfig}
\usepackage{natbib}

\begin{document}
\input{command}
\setcitestyle{round}

\title{Introduction to Bayesian analysis}
\author{W K Kaye}

\date{22nd July 2009}

\include{bayes} %chap:bayes
%\nocite{*}
\bibliographystyle{plainnat}
\bibliography{../../thesis/ref}
\end{document}