APA (7th ed.) Citation

Nelsen, R. B. Proofs without words: Exercises in visual thinking. Math. Assoc. of America.

Chicago Style (17th ed.) Citation

Nelsen, Roger B. Proofs Without Words: Exercises in Visual Thinking. Washington, DC: Math. Assoc. of America.

MLA (9th ed.) Citation

Nelsen, Roger B. Proofs Without Words: Exercises in Visual Thinking. Math. Assoc. of America.

Warning: These citations may not always be 100% accurate.