Παραπομπή APA

Butts, D. (1974). Teaching of science: A self-directed planning guide. Harper and Row.

Παραπομπή Chicago Style

Butts, David. Teaching of Science: A Self-directed Planning Guide. New York: Harper and Row, 1974.

Παραπομπή MLA

Butts, David. Teaching of Science: A Self-directed Planning Guide. Harper and Row, 1974.