Case study report on the competitive impact of HMOs in Philadelphia / submitted by ICF Incorporated to the Office of Health Maintenance Organizations, DHHS
Rockville, Md. : Dept. of Health and Human Services, Public Health Service, Office of the Assistant Secretary for Health, Office of Health Maintenance Organizations, Division of Program Promotion,  and Washington, D.C. : Supt. of Docs., U.S. G.P.O., distributor.