Media type: E-Article Title: Child Psychology Contributor: Shirley, Mary M.; Morgan, John J. B. imprint: University of Illinois Press, 1943 Published in: The American Journal of Psychology Language: Not determined DOI: 10.2307/1417925 ISSN: 0002-9556 Keywords: Arts and Humanities (miscellaneous) ; Developmental and Educational Psychology ; Experimental and Cognitive Psychology Origination: Footnote: