Beckmann, S. (2008). Activities to accompany: Mathematics for elementary teachers (2a. ed.). Pearson Education.
Cita Chicago (17th ed.)Beckmann, Sybilla. Activities to Accompany: Mathematics for Elementary Teachers. 2a. ed. Boston: Pearson Education, 2008.
Cita MLA (9th ed.)Beckmann, Sybilla. Activities to Accompany: Mathematics for Elementary Teachers. 2a. ed. Pearson Education, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.