Tohutoro APA (7th ed.)

Velleman, D. J. (2006). How to prove it: A structured approach (2a. edición.). Cambridge University Press.

Tohutoru Kātū Chicago (17th ed.)

Velleman, Daniel J. How to Prove It: A Structured Approach. 2a. edición. New York, USA: Cambridge University Press, 2006.

Tohutoro MLA (9th ed.)

Velleman, Daniel J. How to Prove It: A Structured Approach. 2a. edición. Cambridge University Press, 2006.