415306 Gechtman, M., & Hardestry, J. (1968). Arithmetic concepts, skills. New York : Macmillan.
Chicagoスタイル(17版)引用形式415306 Gechtman, Murray, , James Hardestry. Arithmetic Concepts, Skills. New York : Macmillan, 1968.
MLA(9版)引用形式415306 Gechtman, Murray, , James Hardestry. Arithmetic Concepts, Skills. New York : Macmillan, 1968.
警告: この引用は必ずしも正確ではありません.