“Like many systems that appear meticulous, the writing of citations is a subjective art. Never more so than in fiction, where citation is an entirely other kind of animal, not required or even expected, except in the “acknowledgments” page, which is often a who’s who of the publishing world. (Also a good way to find out who is married to whom.) But in the last two decades, bibliographies and sources cited pages have increasingly cropped up in the backs of novels.” – The Drift