LEFFINGWELL RICHARD. (2019). BASIC MATH DOUBLING AND MUTIPLYING (2018 Ed.). HEINEMANN LIBRARY.
Chicagoスタイル(17版)引用形式LEFFINGWELL RICHARD. BASIC MATH DOUBLING AND MUTIPLYING. 2018 Ed. MINNESOTA: HEINEMANN LIBRARY, 2019.
MLA(9版)引用形式LEFFINGWELL RICHARD. BASIC MATH DOUBLING AND MUTIPLYING. 2018 Ed. HEINEMANN LIBRARY, 2019.
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