APA (7th ed.) Citation

Hearnden, I., & Harocopos, A. (2000). Problem drug use and probation in London. Research findings, 112, 1-4.

Chicago Style (17th ed.) Citation

Hearnden, Ian, and Alex Harocopos. "Problem Drug Use and Probation in London." Research Findings 112 (2000): 1-4.

MLA (8th ed.) Citation

Hearnden, Ian, and Alex Harocopos. "Problem Drug Use and Probation in London." Research Findings, vol. 112, 2000, pp. 1-4.