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.
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