Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (8th εκδ.)

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