Cita APA (7a ed.)

LEFFINGWELL RICHARD. (2019). BASIC MATH DOUBLING AND MUTIPLYING (2018 Ed.). HEINEMANN LIBRARY.

Cita Chicago Style (17a ed.)

LEFFINGWELL RICHARD. BASIC MATH DOUBLING AND MUTIPLYING. 2018 Ed. MINNESOTA: HEINEMANN LIBRARY, 2019.

Cita MLA (9a ed.)

LEFFINGWELL RICHARD. BASIC MATH DOUBLING AND MUTIPLYING. 2018 Ed. HEINEMANN LIBRARY, 2019.