Leonard Roy Frank

Probably one of the most comprehensive collections of quotations I have ever come across. Over 20,000 quotes organized by subject and then alphabetically by author. Subject headings also include "See Also" lists of other related subjects. For example the subject heading "Nobility" has the subject headings of "Aristocracy", "Class", and "Leaders" listed under it. Also includes both a subject and author index. Organizationally perfect but lacks some of the lighter, more humorous quotations.

Arranged by subject, thus more easy to use than Bartlett's - contains many more new and "pop" items as well. A good source.