Beckmann, S. (2008). Activities to accompany: Mathematics for elementary teachers (2a. ed.). Pearson Education.
Lua i Stíl Chicago (17ú heag.)Beckmann, Sybilla. Activities to Accompany: Mathematics for Elementary Teachers. 2a. ed. Boston: Pearson Education, 2008.
Lua MLA (9ú heag.)Beckmann, Sybilla. Activities to Accompany: Mathematics for Elementary Teachers. 2a. ed. Pearson Education, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.