APA (7th ed.) Citation

Nelsen, R. B. (1993). Proofs without words: Exercises in visual thinking. The Mathematical Association of America.

Chicago Style (17th ed.) Citation

Nelsen, Roger B. Proofs Without Words: Exercises in Visual Thinking. Washington, D.C: The Mathematical Association of America, 1993.

MLA (9th ed.) Citation

Nelsen, Roger B. Proofs Without Words: Exercises in Visual Thinking. The Mathematical Association of America, 1993.