APA (7th ed.) Citation

O'Hare, P. A., Cheung, Y., Riley, D. M., & Erickson, P. G. (1997). Harm Reduction: A New Direction for Drug Policies and Programs. University of Toronto Press.

Chicago Style (17th ed.) Citation

O'Hare, P. A., Yuet-wah Cheung, Diane M. Riley, and Patricia G. Erickson. Harm Reduction: A New Direction for Drug Policies and Programs. Toronto: University of Toronto Press, 1997.

MLA (8th ed.) Citation

O'Hare, P. A., et al. Harm Reduction: A New Direction for Drug Policies and Programs. University of Toronto Press, 1997.