APA (7th ed.) Citation

Karplus, R., & Lavatelli, C. S. (1968). Piaget's developmental theory. Davidson Films, Incorporated.

Chicago Style (17th ed.) Citation

Karplus, Robert, and Celia Stendler Lavatelli. Piaget's Developmental Theory. [San Luis Obispo, California]: Davidson Films, Incorporated, 1968.

MLA (9th ed.) Citation

Karplus, Robert, and Celia Stendler Lavatelli. Piaget's Developmental Theory. Davidson Films, Incorporated, 1968.