APA (7th ed.) Citation

Duffy, N., & Lotman, M. (2010). Physics for the 21st century. Annenberg Learner.

Chicago Style (17th ed.) Citation

Duffy, Neal, and Mo Lotman. Physics for the 21st Century. District of Columbia: Annenberg Learner, 2010.

MLA (9th ed.) Citation

Duffy, Neal, and Mo Lotman. Physics for the 21st Century. Annenberg Learner, 2010.