Gaya APA

Bay-Williams, J, A, V, D, W, K, S, K, J, M. (2010). Elementary & Middle School Mathematics: Teaching Developmentally . Boston: .

Gaya MLA

Bay-Williams, John, A, Van, De, Walle, Karen, S, Karp, Jennifer, M. "Elementary & Middle School Mathematics: Teaching Developmentally". Boston: , 2010. .