APA (7th ed.) Citation

Clements, D. H., & Sarama, J. (2009). Learning and teaching early math: The learning trajectories approach. Routledge.

Chicago Style (17th ed.) Citation

Clements, Douglas H., and Julie Sarama. Learning and Teaching Early Math: The Learning Trajectories Approach. New York: Routledge, 2009.

MLA (8th ed.) Citation

Clements, Douglas H., and Julie Sarama. Learning and Teaching Early Math: The Learning Trajectories Approach. Routledge, 2009.