APA

National Center for Health Statistics U.S, .National Hospital Ambulatory Medical Care Survey. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics.

Chicago

National Center for Health Statistics U.S, .National Hospital Ambulatory Medical Care Survey. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics.

Harvard

National Center for Health Statistics U.S, .National Hospital Ambulatory Medical Care Survey. Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics.

MLA

National Center for Health Statistics U.S, .Hyattsville, Md: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics. .