Cita APA (7a ed.)

Van de Walle, J. A., Karp, K. S., & Bay-Williams, J. M. (2007). Elementary and middle school mathematics: Teaching developmentally (7th ed.). Pearson /Allyn and Bacon.

Cita Chicago Style (17a ed.)

Van de Walle, John A., Karen S. Karp, y Jennifer M. Bay-Williams. Elementary and Middle School Mathematics: Teaching Developmentally. 7th ed. Boston: Pearson /Allyn and Bacon, 2007.

Cita MLA (9a ed.)

Van de Walle, John A., et al. Elementary and Middle School Mathematics: Teaching Developmentally. 7th ed. Pearson /Allyn and Bacon, 2007.