Karyeija, R. F. (1999). The variability of and resistance to sweet potato feathery mottle virus in Africa. Swedish University of Agricultural Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKaryeija, Robert F. The Variability of and Resistance to Sweet Potato Feathery Mottle Virus in Africa. Uppsala: Swedish University of Agricultural Sciences, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKaryeija, Robert F. The Variability of and Resistance to Sweet Potato Feathery Mottle Virus in Africa. Swedish University of Agricultural Sciences, 1999.
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