APA (7e ed.) Bronvermelding
Ginsburg, H., & Opper, S. (1979). Piaget's theory of intellectual development (2nd ed.). Prentice - hall.
Chicago (17e ed.) Bronvermelding
Ginsburg, Herbert, en Sylvia Opper. Piaget's Theory of Intellectual Development. 2nd ed. New Jersey: Prentice - hall, 1979.
MLA (9e ed.) Bronvermelding
Ginsburg, Herbert, en Sylvia Opper. Piaget's Theory of Intellectual Development. 2nd ed. Prentice - hall, 1979.
Let op: Deze citaties zijn niet altijd 100% accuraat.