APA

National Center for Health Statistics U.S, .Ambulatory medical care utilization estimates for. Hyattsville,MD: U.S. Dept. of Health & Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics.

Chicago

National Center for Health Statistics U.S, .Ambulatory medical care utilization estimates for. Hyattsville,MD: U.S. Dept. of Health & Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics.

Harvard

National Center for Health Statistics U.S, .Ambulatory medical care utilization estimates for. Hyattsville,MD: U.S. Dept. of Health & Human Services, 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 & Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics. .