APA (7e ed.) Bronvermelding

Bybee, R. W., & Sund, R. B. (1982). Piaget for educators (2nd ed.). Merrill.

Chicago (17e ed.) Bronvermelding

Bybee, Rodger W., en Robert B. Sund. Piaget for Educators. 2nd ed. Columbus: Merrill, 1982.

MLA (9e ed.) Bronvermelding

Bybee, Rodger W., en Robert B. Sund. Piaget for Educators. 2nd ed. Merrill, 1982.