Gropper, G. L. (1974). Instructional strategies. Educational Technology.
Chicagoスタイル(17版)引用形式Gropper, George L. Instructional Strategies. New Jersey: Educational Technology, 1974.
MLA(9版)引用形式Gropper, George L. Instructional Strategies. Educational Technology, 1974.
警告: この引用は必ずしも正確ではありません.