Dyfyniad APA

Ginsburg, H., & Opper, S. (1969). Piaget's theory of intellectual development: An introduction. Prentice Hall.

Dyfyniad Arddull Chicago

Ginsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development: An Introduction. New Jersey: Prentice Hall, 1969.

Dyfyniad MLA

Ginsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development: An Introduction. Prentice Hall, 1969.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.