APA (7th ed.) Citation

Cowan, D. H., & Weller, C. D. (1984). Preferred provider organizations: Planning, structure, and operation. Aspen Systems Corporation.

Chicago Style (17th ed.) Citation

Cowan, Dale H., and Charles D. Weller. Preferred Provider Organizations: Planning, Structure, and Operation. Rockville: Aspen Systems Corporation, 1984.

MLA (8th ed.) Citation

Cowan, Dale H., and Charles D. Weller. Preferred Provider Organizations: Planning, Structure, and Operation. Aspen Systems Corporation, 1984.