APA (7th ed.) Citation

Pólya, G. (1957). How to solve it: A new aspect of mathematical method (2a. ed.). Princeton University.

Chicago Style (17th ed.) Citation

Pólya, George. How to Solve It: A New Aspect of Mathematical Method. 2a. ed. Princeton: Princeton University, 1957.

MLA (9th ed.) Citation

Pólya, George. How to Solve It: A New Aspect of Mathematical Method. 2a. ed. Princeton University, 1957.