Wikiquote, with individual entries for just about everyone who ever picked up a pen, not only lists a writer’s greatest hits but helpfully links you to the published sources of said hits and, perhaps even more helpfully, includes reliable sections on disputed and misattributed quotes. If you want to explore on your own, make use of the highly searchable books.google.com. If you can’t, with a modicum of effort, find a published source for a quote, the odds are at least reasonable that it’s a sham.
