number and author year style in a single file with natbib package

Question

Is it possible to get both the numbered and the author-year citation style in a single book by using the natbib package?

I need one chapter with numbered and another chapter with author-year style. Is it possible to get the output by using the natbib package?

Answer 1

This uses Alan Munn's suggestion in a comment on the question. I'd tried chapterbib before but got errors, even using the documentation for natbib. However, experimentation suggests the following should work:

\begin{filecontents}{f1.tex}
  \chapter{A chapter}
  \bibliographystyle{plainnat}
  \citestyle{plainnat}
  References to an article, \cite{article-full},
  and to an entire journal, which appears
  only in the references\nocite{whole-journal}.
  \bibliography{xampl}
\end{filecontents}
\begin{filecontents}{f2.tex}
  \chapter{Another chapter}
  \bibliographystyle{plainnat}
  \citestyle{plain}
  A new chapter with a different style and a cite
  of some possibly interesting proceedings, \cite{proceedings-full}.
  \bibliography{xampl}
\end{filecontents}
\documentclass[openany]{book}
\usepackage{chapterbib}
\usepackage[sectionbib]{natbib}
\begin{document}
  \include{f1}
  \include{f2}
\end{document}

Note that various things seem to be crucial here. In particular, you need to issue \citestyle{} which was not obvious to me from the documentation. In particular, you need to do this even when you want to use the plainnat style and even when you've just issued \bibliographystyle{plainnat}. At least, without this, I could not get the correct format to be used.