Não informado. (1919). Hospital social service. Hospital Social Service Association of New York City.
Chicago-Zitierstil (17. Ausg.)Não informado. Hospital Social Service. New York: Hospital Social Service Association of New York City, 1919.
MLA-Zitierstil (8. Ausg.)Não informado. Hospital Social Service. Hospital Social Service Association of New York City, 1919.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.