APA (7th ed.) Citation

Walker, A., Leary, H., Hmelo-Silver, C. E., & Ertmer, P. A. (2015). Essential readings in problem-based learning. Purdue University Press.

Chicago Style (17th ed.) Citation

Walker, Andrew, Heather Leary, Cindy E. Hmelo-Silver, and Peggy A. Ertmer. Essential Readings in Problem-based Learning. West Lafayette, Indiana: Purdue University Press, 2015.

MLA (8th ed.) Citation

Walker, Andrew, et al. Essential Readings in Problem-based Learning. Purdue University Press, 2015.