Harper, K. (2021). Plagues upon the earth: Disease and the course of human history. Princeton University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHarper, Kyle. Plagues upon the Earth: Disease and the Course of Human History. Princeton: Princeton University Press, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHarper, Kyle. Plagues upon the Earth: Disease and the Course of Human History. Princeton University Press, 2021.
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