201784 Krulik, S., & Rudnick, J. A. (1980). Problem solving: A handbook for teachers. Boston : Allyn and Bacon.
Cita Chicago (17th ed.)201784 Krulik, Stephen, i Jesse A. Rudnick. Problem Solving: A Handbook for Teachers. Boston : Allyn and Bacon, 1980.
Cita MLA (9th ed.)201784 Krulik, Stephen, i Jesse A. Rudnick. Problem Solving: A Handbook for Teachers. Boston : Allyn and Bacon, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.