Não informado. (1919). Hospital social service. Hospital Social Service Association of New York City.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Hospital Social Service. New York: Hospital Social Service Association of New York City, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Hospital Social Service. Hospital Social Service Association of New York City, 1919.
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