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Figure This!

Engel, Arthur. "The Box Principle," In Problem-Solving Strategies. New York: Springer-Verlag, 1991. pp. 39-58.

Gardner, Martin. Aha! Insight. New York: Scientific American, Inc., 1978.

Larson, Loren C. "Pigeonhole Principle," In Problem-Solving Through Problems. New York: Springer-Verlag, 1981. pp. 79-83.

 

The Pigeonhole Principle
www.cut-the-knot.com/do_you_know/pigeon.html

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