Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Polya, Gyorgy. How to Solve It: A New Aspect Mathematical Method. 2a ed. New York: Doubleday, 1957.

Cita MLA (9a ed.)

Polya, Gyorgy. How to Solve It: A New Aspect Mathematical Method. 2a ed. Doubleday, 1957.