APA

Cypress B. K., National Center for Health Statistics (U.S.) & National Ambulatory Medical Care Survey (U.S.). (1981). Patients' reasons for visiting physicians: the National Ambulatory Medical Care Survey, United States, 1977-78. Hyattsville, Md: U.S. Department of Health and Human Services, Public Health Service, Office of Health Research, Statistics, and Technology, National Center for Health Statistics.

Chicago

Cypress Beulah K, National Center for Health Statistics (U.S.) and National Ambulatory Medical Care Survey (U.S.). 1981. Patients' reasons for visiting physicians: the National Ambulatory Medical Care Survey, United States, 1977-78. Hyattsville, Md: U.S. Department of Health and Human Services, Public Health Service, Office of Health Research, Statistics, and Technology, National Center for Health Statistics.

Harvard

Cypress B. K., National Center for Health Statistics (U.S.) and National Ambulatory Medical Care Survey (U.S.). (1981). Patients' reasons for visiting physicians: the National Ambulatory Medical Care Survey, United States, 1977-78. Hyattsville, Md: U.S. Department of Health and Human Services, Public Health Service, Office of Health Research, Statistics, and Technology, National Center for Health Statistics.

MLA

Cypress Beulah K, National Center for Health Statistics (U.S.) and National Ambulatory Medical Care Survey (U.S.). Patients' reasons for visiting physicians: the National Ambulatory Medical Care Survey, United States, 1977-78. Hyattsville, Md: U.S. Department of Health and Human Services, Public Health Service, Office of Health Research, Statistics, and Technology, National Center for Health Statistics. 1981.