Παραπομπή APA

Wittrock, M. (1970). Evalution of Instruction. Holt, Rinehart and Winston, Inc.

Παραπομπή Chicago Style

Wittrock, M.C. Evalution of Instruction. New York: Holt, Rinehart and Winston, Inc, 1970.

Παραπομπή MLA

Wittrock, M.C. Evalution of Instruction. Holt, Rinehart and Winston, Inc, 1970.