American Journal of Orthopsychiatry · 1951 · 80 citations · 8 references
EducationHuman DevelopmentChild DevelopmentSex DifferencesSexual DimorphismAge Differences In PlayCross-sex PlayPlay OntogenyPlay PreferencesSex Differences In Play
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C. M. Louttit · Journal of Applied Psychology · 1939 · 2K citations
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Francis W. Irwin · Europe PMC (PubMed Central) · 1932 · 1.9K citations
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