201784 Krulik, S., & Rudnick, J. A. (1980). Problem solving: A handbook for teachers. Boston : Allyn and Bacon.
Čikaški stil citiranja (17. izdanje)201784 Krulik, Stephen, i Jesse A. Rudnick. Problem Solving: A Handbook for Teachers. Boston : Allyn and Bacon, 1980.
MLA način citiranja (9. izdanje)201784 Krulik, Stephen, i Jesse A. Rudnick. Problem Solving: A Handbook for Teachers. Boston : Allyn and Bacon, 1980.
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