APA (7th ed.) Citation

Polya, G. (1971). How to solve it: A new aspect of mathematical method (2d ed.). Princeton University Press.

Chicago Style (17th ed.) Citation

Polya, George. How to Solve It: A New Aspect of Mathematical Method. 2d ed. Princeton, N.J.: Princeton University Press, 1971.

MLA (9th ed.) Citation

Polya, George. How to Solve It: A New Aspect of Mathematical Method. 2d ed. Princeton University Press, 1971.