Johnson, K., & Herr, T. (2001). Problem solving strategies: Crossing the river with dogs : and other mathematical adventures (2nd ed.). Key Curriculum Press.
Citace podle Chicago (17th ed.)Johnson, Ken, a Ted Herr. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. 2nd ed. Emeryville, Calif: Key Curriculum Press, 2001.
Citace podle MLA (9th ed.)Johnson, Ken, a Ted Herr. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. 2nd ed. Key Curriculum Press, 2001.
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