Wall, W., & Piaget, J. (1975). Constructive education for children.
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Chicago-čujuhus (17. p.)
Wall, W.D, juo Jean Piaget. Constructive Education for Children. 1975.
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MLA-čujuhus (9. p.)
Wall, W.D, juo Jean Piaget. Constructive Education for Children. 1975.
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