When you give a reference to the source of information of something you write.  random quote by rocko2012.
Its worth pointing out that
'You have referenced the book'
Wasn't accepted Dec14. I will report because i think it's a synonym of cited and also 'mentioned' was accepted, so go figure.
Good ... I put " you have quoted the book" thinking I would be pinged for not including From but I wasn't !
I think there is a large difference between "cited" and "quoted". If you cite something you use that as another source of information, like in an essay. If you quote something you only take a small piece of whatever it is.
Citar can refer to quoting a text, citing a book or a paper, and requesting someone to appear before you ("cite him to you").
As a former academic, I cannot imagine that Spanish speaking academics wouldn't distinguish between "cite" and "quote" or "citation" and "quotation". It's important in those circles. I would guess that they do so by context. For example, "I cited the book" and "I quoted that sentence from the book." In fact, in the academic world, if you quoted from a book, you would definitely be required to also cite the book. In this Duo example, cite is probably the best answer because you'd never quote an entire book. Phew, now that's a long-winded academic comment.
I've always found it interesting that academic words tend to be similar.
Latin used to be the academic language. A lot of the language is still in use there. :)
Tengo una pregunta: As I understand it, when speaking Spanish, leading 'h's are dropped. So are the Spanish words 'a' ('to') and 'ha' ('you/he/she has') both pronounced 'a' (short 'a')?