APA (7th ed.) Citation

Riley, K. J. (1997). Comparing drug purchase and use patterns in six cities. Journal, 234, 31-32.

Chicago Style (17th ed.) Citation

Riley, K. Jack. "Comparing Drug Purchase and Use Patterns in Six Cities." Journal 234 (1997): 31-32.

MLA (8th ed.) Citation

Riley, K. Jack. "Comparing Drug Purchase and Use Patterns in Six Cities." Journal, 234, 1997, pp. 31-32.