Não informado. (1919). Hospital social service. Hospital Social Service Association of New York City.
Chicago-referens (17:e uppl.)Não informado. Hospital Social Service. New York: Hospital Social Service Association of New York City, 1919.
MLA-referens (8:e uppl.)Não informado. Hospital Social Service. Hospital Social Service Association of New York City, 1919.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.