Ginsburg, H., & Opper, S. (1969). Piaget's theory of intellectual development : an introduction / (by) Herbert Ginsburg, Sylvia Opper: An introduction. Prentice-Hall.
Chicago Style (17th ed.) CitationGinsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development : An Introduction / (by) Herbert Ginsburg, Sylvia Opper: An Introduction. Englewood Cliffs (N.J.): Prentice-Hall, 1969.
MLA (9th ed.) CitationGinsburg, Herbert, and Sylvia Opper. Piaget's Theory of Intellectual Development : An Introduction / (by) Herbert Ginsburg, Sylvia Opper: An Introduction. Prentice-Hall, 1969.
Warning: These citations may not always be 100% accurate.