Hartup, W. W. (1967). The young child. Reviews of research. National Association for the Education of Young Children.
Citace podle Chicago (17th ed.)Hartup, Willard W. The Young Child. Reviews of Research. Washington: National Association for the Education of Young Children, 1967.
Citace podle MLA (9th ed.)Hartup, Willard W. The Young Child. Reviews of Research. National Association for the Education of Young Children, 1967.
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