(1939). Foundations of educational psychology; nature's gifts to man. Longmans.
Chicago-referens (17:e uppl.)Foundations of Educational Psychology; Nature's Gifts to Man. New York: Longmans, 1939.
MLA-referens (9:e uppl.)Foundations of Educational Psychology; Nature's Gifts to Man. Longmans, 1939.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.