Douglas, P. H. (1971). Social security in the United States: An analysis and appraisal of the Federal Social Security Act ([2d ed.].). Da Capo.

Douglas, Paul Howard. Social Security in the United States: An Analysis and Appraisal of the Federal Social Security Act. [2d ed.]. New York: Da Capo, 1971.

Douglas, Paul Howard. Social Security in the United States: An Analysis and Appraisal of the Federal Social Security Act. [2d ed.]. Da Capo, 1971.