Also, possibly, an item my wife pointed out to me was the common use on "back blurbs" of referencing other best-selling books by the same author. I guess they do it on "back blurbs" of movies as well. Failing some sort of literary history, I suppose one has to forget that approach or else throw in a few words to the effect of, "So-and-so is an up-and-coming author...blah, blah, blah."