APA-referens

Polya, G. (1957). How to solve it: New aspect of mathematical methods (2nd ed.). Prenceton.

Chicago-stil citat

Polya, G. How to Solve It: New Aspect of Mathematical Methods. 2nd ed. New Jersey: Prenceton, 1957.

MLA-referens

Polya, G. How to Solve It: New Aspect of Mathematical Methods. 2nd ed. Prenceton, 1957.