- How You Too Can Develop a Razor-Sharp Mind and a Steel-Trap Memory by Gerardo Joffe, 15 November, 2000
- Visual Classroom Testing Arithematic by Alick Hartley, Jeff Chapman, et all 27 April, 2001
- Arithematics; a text for elementary school teachers by Robert L. Johnson,
- How You Too Can Develop a Razor-Sharp Mind and a Steel-Trap Memory by Gerardo Joffe, 15 November, 2000
- Visual Classroom Testing Arithematic by Alick Hartley, Jeff Chapman, et all 27 April, 2001
- Arithematics; a text for elementary school teachers by Robert L. Johnson,
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