[Tex/LaTex] How to one cite theorems of references

Question

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?

Answer 1

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}

\addbibresource{\jobname.bib}

\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}