annotation, notation, note - a comment or instruction (usually added); "his notes were appended at the end of the article"; "he added a short notation to the address on the envelope"

photo credit - a note acknowledging the source of a published photograph

cross-index, cross-reference - a reference at one place in a work to information at another place in the same work

excerpt, extract, selection - a passage selected from a larger work; "he presented excerpts from William James' philosophical writings"

epigraph - a quotation at the beginning of some piece of writing

mimesis - the representation of another person's words in a speech

misquotation - an incorrect quotation

statement - a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc; "according to his statement he was in London on that day"

practice, pattern - a customary way of operation or behavior; "it is their practice to give annual raises"; "they changed their dietary pattern"