APA

United States, . (1997). Earnings and employment data for workers covered under social security, by state and county. Washington, D.C: Social Security Administration, Office of Research, Evaluation, and Statistics.

Chicago

United States, . 1997. Earnings and employment data for workers covered under social security, by state and county. Washington, D.C: Social Security Administration, Office of Research, Evaluation, and Statistics.

Harvard

United States, . (1997). Earnings and employment data for workers covered under social security, by state and county. Washington, D.C: Social Security Administration, Office of Research, Evaluation, and Statistics.

MLA

United States, . Earnings and employment data for workers covered under social security, by state and county. Washington, D.C: Social Security Administration, Office of Research, Evaluation, and Statistics. 1997.