Gaya APA

Krulik, S., Rudnick, , J, A. (1988). Problem solving : a handbook for senior high school teachers . Boston, MA: Allyn and Bacon.

Gaya MLA

Krulik, Stephen., Rudnick, , Jasse, A.. "Problem solving : a handbook for senior high school teachers". Boston, MA: Allyn and Bacon, 1988. Text.