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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?

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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.




  author = {Author, A.},
  year = {2001},
  title = {Alpha},



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

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

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



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