Hartwig, G. W., & Hartwig, G. W. (1978). Disease in African history: An introductory survey and case studies. Duke University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHartwig, Gerald W., और Gerald W.;Patterson Hartwig. Disease in African History: An Introductory Survey and Case Studies. Duke University Press, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHartwig, Gerald W., और Gerald W.;Patterson Hartwig. Disease in African History: An Introductory Survey and Case Studies. Duke University Press, 1978.
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