APA (7e ed.) Bronvermelding

Herr, T., & Johnson, K. (1994). Problem solving strategies: Crossing the river with dogs : and other mathematical adventures. Key Curriculum Press.

Chicago (17e ed.) Bronvermelding

Herr, Ted, en Ken Johnson. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. Berkeley, Calif.: Key Curriculum Press, 1994.

MLA (9e ed.) Bronvermelding

Herr, Ted, en Ken Johnson. Problem Solving Strategies: Crossing the River with Dogs : And Other Mathematical Adventures. Key Curriculum Press, 1994.