APA-viite (7. p.)
Polya, G., & Hilton, P. J. (1981). Mathematical Discovery: On Understanding, Learning, and Teaching Problem Solving.
Chicago-viite (17. p.)
Polya, George, ja Peter John Hilton. Mathematical Discovery: On Understanding, Learning, and Teaching Problem Solving. 1981.
MLA-viite (9. p.)
Polya, George, ja Peter John Hilton. Mathematical Discovery: On Understanding, Learning, and Teaching Problem Solving. 1981.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.