Barnard, B. (2009). Outbreak!: Plagues that changed history.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarnard, Bryn. Outbreak!: Plagues That Changed History. 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBarnard, Bryn. Outbreak!: Plagues That Changed History. 2009.
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