##  Class files

The next two commands are the ones that set the bibliography style and import the bibliography file. See Bibliography management with bibtex for more information.

\bibliographystyle{stylename}
\bibliography{bibfile}

where bibfile is the name of the bibliography .bib file without the extension and stylename is one of the following:

stylename output
abbrv
acm
alpha
apalike
ieeetr
plain
siam
unsrt