APA (7e ed.) Bronvermelding

Caldwell, J. H., Karp, K. S., Bay Williams, J. M., Rathmell, E., & Zbiek, R. M. Developing essential understanding of addition and subtraction for teaching mathematics in prekindergarten-grade 2.

Chicago (17e ed.) Bronvermelding

Caldwell, Janet H., Karen S. Karp, Jannifer M. Bay Williams, Ed Rathmell, en Rose Mary Zbiek. Developing Essential Understanding of Addition and Subtraction for Teaching Mathematics in Prekindergarten-grade 2.

MLA (8e ed.) Bronvermelding

Caldwell, Janet H., et al. Developing Essential Understanding of Addition and Subtraction for Teaching Mathematics in Prekindergarten-grade 2.