John Hancock Mutual Life Insurance Company. Life Conservation Service. Pneumonia: Its Care and Prevention.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohn Hancock Mutual Life Insurance Company. Life Conservation Service. Pneumonia: Its Care and Prevention.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJohn Hancock Mutual Life Insurance Company. Life Conservation Service. Pneumonia: Its Care and Prevention.
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