Cita APA (7a ed.)
Polya, G. How to Solve It: A New Aspect of Mathematical Method. Doubleday.
Cita estilo Chicago (17a ed.)
Polya, George. How to Solve It: A New Aspect of Mathematical Method. Garden City, EUA: Doubleday.
Cita MLA (9a ed.)
Polya, George. How to Solve It: A New Aspect of Mathematical Method. Doubleday.
Precaución: Estas citas no son 100% exactas.