National Conference on Social Security New York & American Association for Social Security. (1930). Old age security progress: Report on proceedings of the third National conference on old age security, held in New York city, April 25, 1930. American association for old age security.
Chicago-referens (17:e uppl.)National Conference on Social Security New York och American Association for Social Security. Old Age Security Progress: Report on Proceedings of the Third National Conference on Old Age Security, Held in New York City, April 25, 1930. New York city: American association for old age security, 1930.
MLA-referens (8:e uppl.)National Conference on Social Security New York och American Association for Social Security. Old Age Security Progress: Report on Proceedings of the Third National Conference on Old Age Security, Held in New York City, April 25, 1930. American association for old age security, 1930.