1. Low income and barriers to use of health services;Bergner;New Eng. J. Med.,1968
2. Factors affecting waiting time in ambulatory care services;Johnson;Health Serv. Res.,1968
3. The Health of Regionville. What the people thought and did about it.;Koos,1954
4. Symptom sensitivity: Its social and cultural correlates;Hetherington;Health Serv. Res.,1969
5. Volume of physician visits, United States—July, 1966, to June, 1967,1968