Cita APA (7a ed.)

Williams, G. A. (2013). How math works: A guide to grade school arithmetic for parents and teachers. Rowman and Littlefield Publishers, Incorporated.

Cita Chicago Style (17a ed.)

Williams, G. Arnell. How Math Works: A Guide to Grade School Arithmetic for Parents and Teachers. Lanham: Rowman and Littlefield Publishers, Incorporated, 2013.

Cita MLA (8a ed.)

Williams, G. Arnell. How Math Works: A Guide to Grade School Arithmetic for Parents and Teachers. Rowman and Littlefield Publishers, Incorporated, 2013.