Ginsburg, H., & Opper, S. (1969). Piaget's theory of intellectual development: An introd. Prentice Hall.
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Chicago-čujuhus (17. p.)
Ginsburg, Herbert, juo Sylvia Opper. Piaget's Theory of Intellectual Development: An Introd. Englewood cliffs, USA: Prentice Hall, 1969.
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MLA-čujuhus (9. p.)
Ginsburg, Herbert, juo Sylvia Opper. Piaget's Theory of Intellectual Development: An Introd. Prentice Hall, 1969.
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