How do you say a "quote" as in a "quote from a author"
引号  quotation mark

引文  quoted passage (usually in written format, rather than verbal format)

引用  to quote from some place

As a result, "quote from an author" should be "作者的引文", which is the only grammatically correct choice among the three words. However, it seems to be very unnatural for native Chinese speaker. The more native expression should be "作者曾说过" (the author has said).