Bartlett’s for the classics (published 1919).
Bartleby.com has Bartlett’s and two other sources.
Bartlett, John. 1919. Familiar Quotations, 10th ed.
Including over 11,000 quotations, the first new edition of John Bartlett’s corpus to be published after his death in 1905 keeps most of his original work intact.
Hoyt’s New Cyclopedia of Practical Quotations. 1922.
The 21,700 quotations in this standard reference bible, organized by major category, feature original language with translations.
Respectfully Quoted: A Dictionary of Quotations. 1989.
The 2,100 entries in this eminently researched collection form the constellation of collected wisdom in American political debate.