Não informado. (1956). Social Work. National Association of Social Workers.
Chicago-referens (17:e uppl.)Não informado. Social Work. Silver Spring, Md: National Association of Social Workers, 1956.
MLA-referens (8:e uppl.)Não informado. Social Work. National Association of Social Workers, 1956.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.