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.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Conference on Social Security New York και 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.
Παραπομπή σε μορφή MLA (8th εκδ.)National Conference on Social Security New York και 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.