Dyfyniad APA

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

Dyfyniad Arddull Chicago

Velleman, Daniel J. How to Prove It: A Structured Approach. 2nd ed. Cambridge ; New York: Cambridge University Press, 2006.

Dyfyniad MLA

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

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