Wadsworth, B. J. (2004). Piaget's theory of cognitive and affective development (5a. ed.). Pearson Education Inc.
Citace podle Chicago (17th ed.)Wadsworth, Barry J. Piaget's Theory of Cognitive and Affective Development. 5a. ed. Boston: Pearson Education Inc, 2004.
Citace podle MLA (9th ed.)Wadsworth, Barry J. Piaget's Theory of Cognitive and Affective Development. 5a. ed. Pearson Education Inc, 2004.
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