- Tomorrow's Math: Unsolved Problems for the Amateur by Charles Stanley Ogilvy, 1972-02
- Tomorrow's Math: Unsolved Problems for the Amateur by C. Stanley Ogilvy, 1962
- Math Odyssey 2000: Puzzles, Mysteries, Unsolved Problems, Breakthroughs, and the People of Mathematics by Clement W. Falbo, 1994-01
- Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics by John Derbyshire, 2004-05-25
- Tomorrows Math 2ND Edition Unsolved Problems Fro by C Stanley Ogilvy, 1972
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