Cita APA (7th ed.)

Johnson, K., & Herr, T. (2001). Problem solving strategies: Crossing the river with dogs : and other mathematical adventures (2nd ed.). Key Curriculum Press.

Cita Chicago (17th ed.)

Johnson, Ken, i Ted Herr. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. 2nd ed. Emeryville, Calif: Key Curriculum Press, 2001.

Cita MLA (9th ed.)

Johnson, Ken, i Ted Herr. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. 2nd ed. Key Curriculum Press, 2001.