APA (7th ed.) Citation

Ginsburg, H., & Opper, S. (1979). Piaget's theory of intellectual development (2nd ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Ginsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development. 2nd ed. Englewood Cliffs, New Jersey: Prentice-Hall, 1979.

MLA (9th ed.) Citation

Ginsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development. 2nd ed. Prentice-Hall, 1979.