Beard, R. M. (1969). An outline of Piaget's developmental psychology, for students and teachers. Routledge and Kegan Paul.
Citace podle Chicago (17th ed.)Beard, Ruth M. An Outline of Piaget's Developmental Psychology, for Students and Teachers. London: Routledge and Kegan Paul, 1969.
Citace podle MLA (9th ed.)Beard, Ruth M. An Outline of Piaget's Developmental Psychology, for Students and Teachers. Routledge and Kegan Paul, 1969.
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