APA Citation

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

Chicago Style Citation

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

MLA Citation

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

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