APA (7th ed.) Citation

Cowan, D. H. (1984). Preferred provider organizations: Planning, structure, and operation. Aspen Systems Corp..

Chicago Style (17th ed.) Citation

Cowan, Dale H. Preferred Provider Organizations: Planning, Structure, and Operation. Rockville, Md.: Aspen Systems Corp., 1984.

MLA (8th ed.) Citation

Cowan, Dale H. Preferred Provider Organizations: Planning, Structure, and Operation. Aspen Systems Corp., 1984.