APA (7th ed.) Citation

Hopwood, M., Mabry, J. C., & Sibley, W. L. (1980). A first-order characterization of clinical trials. Rand Corp..

Chicago Style (17th ed.) Citation

Hopwood, Marsha, John C. Mabry, and W. L. Sibley. A First-order Characterization of Clinical Trials. Santa Monica, CA: Rand Corp., 1980.

MLA (8th ed.) Citation

Hopwood, Marsha, et al. A First-order Characterization of Clinical Trials. Rand Corp., 1980.