Cita APA (7a ed.)

Polya, G. (1957). How to solve it: A new aspect of mathematical method (2nd ed.). Doubleday.

Cita Chicago Style (17a ed.)

Polya, G. How to Solve It: A New Aspect of Mathematical Method. 2nd ed. New York: Doubleday, 1957.

Cita MLA (8a ed.)

Polya, G. How to Solve It: A New Aspect of Mathematical Method. 2nd ed. Doubleday, 1957.