APA (7th ed.) Citation

Twombly, E., Fink, G., & Bricker, D. D. (2004). Ages & stages learning activities. P.H. Brookes Pub.

Chicago Style (17th ed.) Citation

Twombly, Elizabeth, Ginger Fink, and Diane D. Bricker. Ages & Stages Learning Activities. Baltimore, Md: P.H. Brookes Pub, 2004.

MLA (9th ed.) Citation

Twombly, Elizabeth, et al. Ages & Stages Learning Activities. P.H. Brookes Pub, 2004.