Παραπομπή APA

Thier, H. D. (1970). Teaching elementary school science a laboratory approach. Sterling.

Παραπομπή Chicago Style

Thier, Herbert D. Teaching Elementary School Science a Laboratory Approach. New Delhi: Sterling, 1970.

Παραπομπή MLA

Thier, Herbert D. Teaching Elementary School Science a Laboratory Approach. Sterling, 1970.