LEFFINGWELL RICHARD. (2019). BASIC MATH SUBTRACTING & TAKING AWAY (2018 Ed.). HEINEMANN LIBRARY.
Citazione stile Chigago Style (17a edizione)LEFFINGWELL RICHARD. BASIC MATH SUBTRACTING & TAKING AWAY. 2018 Ed. MINNESOTA: HEINEMANN LIBRARY, 2019.
Citatione MLA (9a ed.)LEFFINGWELL RICHARD. BASIC MATH SUBTRACTING & TAKING AWAY. 2018 Ed. HEINEMANN LIBRARY, 2019.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.