APA (7th ed.) Citation

Knapp, R. J., & Capel, W. C. (1979). Drug use among the elderly. Journal of drug issues.

Chicago Style (17th ed.) Citation

Knapp, Ronald J., and William C. Capel. "Drug Use Among the Elderly." Journal of Drug Issues 1979.

MLA (9th ed.) Citation

Knapp, Ronald J., and William C. Capel. "Drug Use Among the Elderly." Journal of Drug Issues, 1979.

Warning: These citations may not always be 100% accurate.