# How can one cite theorems of references?

I would like to cite the item (iii) of proposition 3 of a reference. How can I do it? Which ways do you suggest? This is a question not only about LaTeX, but also about style. One option I have seen to cite pages of a reference is \cite[p.~333]{Audet}. Is there something similar to cite theorems, propositions and so on?

The optional argument of \cite & friends is mostly used for page numbers, but references to chapters/sections, paragraphs, verses etc. are not unheard of. Assuming that a declaration like "Proposition 3.iii" will refer to a unique location in your source, there's nothing wrong in using \cite[Proposition~3.iii]{<source>}. (One may still add the page number, too.)

Note that the biblatex package will automatically detect if the optional argument of a citation command contains only numbers and will by default automatically add a page prefix in this case. One may also manually add such a prefix using the \pno (for singular) or \ppno (for plural) macros. See section 3.12.3 of the manual for details.

\documentclass{article}

\usepackage{biblatex}

\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@misc{A01,
author = {Author, A.},
year = {2001},
title = {Alpha},
}
\end{filecontents}

\begin{document}

Some text \autocite[Proposition~3.iii]{A01}.

Some more text \autocite[Proposition~3.iii on \pno~99]{A01}.

Some more text \autocite[99]{A01}.

\printbibliography

\end{document}


• Just to mention that \cite[Proposition~3.iii]{<source>} will work for almost all \cite implementations in LaTeX (whether it be the definition from the LaTeX kernel, natbib or some other package). biblatex is not required. But biblatex has nice features like the automatic detection of page numbers and addition of "p."/"pp." if needed. – moewe Mar 20 at 9:26