/ Thesaurus / S Synonyms of source book Find synonyms for: Noun1. source book, reference book, reference, reference work, book of factsusage: a collection of historically important documents published together as a bookWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language