Não informado. (1949). Occupational Health. Royal College of Nursing Society of Occupational Health Nursing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Occupational Health. London: Royal College of Nursing Society of Occupational Health Nursing, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Occupational Health. Royal College of Nursing Society of Occupational Health Nursing, 1949.
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