Cita APA (7th ed.)

Erickson, M. J., & Flowers, J. (1999). Principles of mathematical problem solving. Prentice Hall.

Cita Chicago (17th ed.)

Erickson, Martin J., i Joe Flowers. Principles of Mathematical Problem Solving. Upper Saddle River, N.J: Prentice Hall, 1999.

Cita MLA (9th ed.)

Erickson, Martin J., i Joe Flowers. Principles of Mathematical Problem Solving. Prentice Hall, 1999.