When you are citing numerical data retrieved from online databases and web sites, we recommend including the following elements:
Department of Health and Human Services, National Center for Health Statistics (1993). “National Health Provider Inventory: Home Health Agencies and Hospices, 1991” [Data file]. Available from National Technical Information Service Web site, http://classic.ntis.gov. Retrieved March 21, 2017.
U.S. Census Bureau. “Health Insurance Coverage Status and Type of Coverage–All Persons by Sex, Race and Hispanic Origin: 2013 to 2015.” Health Insurance Historical Table 1 [Data file] . https://www.census.gov/data/tables/time-series/demo/health-insurance/historical-series/hic.html. Retrieved March 21, 2017.