(1939). Foundations of educational psychology; nature's gifts to man. Longmans.
Citazione stile Chigago Style (17a edizione)Foundations of Educational Psychology; Nature's Gifts to Man. New York: Longmans, 1939.
Citatione MLA (9a ed.)Foundations of Educational Psychology; Nature's Gifts to Man. Longmans, 1939.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.