Não informado. (1919). Hospital social service. Hospital Social Service Association of New York City.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Hospital Social Service. New York: Hospital Social Service Association of New York City, 1919.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Hospital Social Service. Hospital Social Service Association of New York City, 1919.
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