Cita APA (7a ed.)

Polya, G. (1948). How to solve it.A new aspect of matemathical method. Princeton University Press.

Cita Chicago Style (17a ed.)

Polya, G. How to Solve It.A New Aspect of Matemathical Method. Princeton: Princeton University Press, 1948.

Cita MLA (9a ed.)

Polya, G. How to Solve It.A New Aspect of Matemathical Method. Princeton University Press, 1948.