APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.