ENGEN, H. V. Foundations of elementary school arithmetic. Scott.
Chicagoスタイル(17版)引用形式ENGEN, Henry Van. Foundations of Elementary School Arithmetic. Chicago: Scott.
MLA(9版)引用形式ENGEN, Henry Van. Foundations of Elementary School Arithmetic. Scott.
警告: この引用は必ずしも正確ではありません.