Merkoša sitáhtat
APA-čujuhus (7. p.)
Ginsburg, H., & Opper, S. (1979). Piaget's theory of intellectual development (2nd ed.). Prentice - hall.
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Chicago-čujuhus (17. p.)
Ginsburg, Herbert, juo Sylvia Opper. Piaget's Theory of Intellectual Development. 2nd ed. New Jersey: Prentice - hall, 1979.
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MLA-čujuhus (9. p.)
Ginsburg, Herbert, juo Sylvia Opper. Piaget's Theory of Intellectual Development. 2nd ed. Prentice - hall, 1979.
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