APA (7th ed.) Citation
Ginsburg, H., & Opper, S. (1979). Piaget's theory of intellectual development (2d ed.). Prentice-Hall.
Chicago Style (17th ed.) Citation
Ginsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1979.
MLA (9th ed.) Citation
Ginsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development. 2d ed. Prentice-Hall, 1979.
Warning: These citations may not always be 100% accurate.