The International Thesaurus of Quotations by Eugene H. Ehrlich (Editor), Marshall Debruhl (Compiler) More than 16,000 quotations organized by subject, not author. With categories ranging from Ability to Zen, there are plenty to choose from (over 1000 categories). There is also an author listing in the back, just in case you need to look up quotes by author. [More Reference Quotation Books]
Speaker's Lifetime Library by Leonard Spinrad, Thelma Spinrad (Contributor), Anistatia R. Miller, Jared Brown This isn't a quote book, but it does have a large list of quotes within it. They are organized by subject and have really good attributes. It also contains a section for comparisons, and a calendar of historical events. [More Other Reference Books]
