Hartmann, G. W. (1941). Educational psychology. American Book Company.
Chicagoスタイル(17版)引用形式Hartmann, George Wilfried. Educational Psychology. New York, Cincinnati: American Book Company, 1941.
MLA(9版)引用形式Hartmann, George Wilfried. Educational Psychology. American Book Company, 1941.
警告: この引用は必ずしも正確ではありません.