APA (7th ed.) Citation

Kemp, P., Neale, J., & Robertson, M. (2006). Homelessness among problem drug users: Prevalence, risk factors and trigger events.

Chicago Style (17th ed.) Citation

Kemp, P., J. Neale, and M. Robertson. Homelessness Among Problem Drug Users: Prevalence, Risk Factors and Trigger Events. 2006.

MLA (9th ed.) Citation

Kemp, P., et al. Homelessness Among Problem Drug Users: Prevalence, Risk Factors and Trigger Events. 2006.