The Oxford Dictionary of Quotations
Apronisms: Pocket Wisdom for Every Day
Positive Thinking Every Day: An Inspiration for Each Day of the Year
The Book of Positive Quotations, 2nd Edition
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Oxymoronica: Paradoxical Wit & Wisdom From History's Greatest Wordsmiths
The Wise and Witty Quote Book: More than 2000 Quotes to Enlighten, Encourage, and Enjoy