U.S. Bureau of Old-Age and Survivors Insurance. (1940). Old-age and survivors insurance statistics. Employment and wages of covered workers, 1938-. Federal Security Agency, Social Security Board, Bureau of Old-age and Survivors Insurance.
Cita Chicago (17th ed.)U.S. Bureau of Old-Age and Survivors Insurance. Old-age and Survivors Insurance Statistics. Employment and Wages of Covered Workers, 1938-. Washington, D.C: Federal Security Agency, Social Security Board, Bureau of Old-age and Survivors Insurance, 1940.
Cita MLA (9th ed.)U.S. Bureau of Old-Age and Survivors Insurance. Old-age and Survivors Insurance Statistics. Employment and Wages of Covered Workers, 1938-. Federal Security Agency, Social Security Board, Bureau of Old-age and Survivors Insurance, 1940.