Morton, R. L. (1937). Teaching arithmetic in elementary school. Silver Burdett company.
Chicagoスタイル(17版)引用形式Morton, Robert Lee. Teaching Arithmetic in Elementary School. New York, boston [etc.]: Silver Burdett company, 1937.
MLA(9版)引用形式Morton, Robert Lee. Teaching Arithmetic in Elementary School. Silver Burdett company, 1937.
警告: この引用は必ずしも正確ではありません.