A LaTeX file, bibtex_example.tex:
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  \documentclass[12pt]{article}
  \bibliographystyle{plain}                         % -- THIS
  \begin{document}
  \title{Mathematics Examples}
  \author{Simon Hood}
  \maketitle
  Leslie Lamport's book \cite{ll:latexbook} is the obvious 
  place to start, but is probably better as the second or 
  third place.  
  A better place is {\it Essential \LaTeX} 
  \cite{jw:essential}.                              % -- THIS
  \bibliography{tex_resources}                      % -- THIS
  \end{document}
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