LEFFINGWELL RICHARD. (2019). BASIC MATH SHARING AND DIVIDING (2018 Ed.). HEINEMANN LIBRARY.
Lua i Stíl Chicago (17ú heag.)LEFFINGWELL RICHARD. BASIC MATH SHARING AND DIVIDING. 2018 Ed. MINNESOTA: HEINEMANN LIBRARY, 2019.
Lua MLA (9ú heag.)LEFFINGWELL RICHARD. BASIC MATH SHARING AND DIVIDING. 2018 Ed. HEINEMANN LIBRARY, 2019.
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