Hafernik, J. E. (1982). Phenetics and ecology of hybridization in buckeye butterflies (Lepidoptera: Nymphalidae). University of California.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHafernik, John E. Phenetics and Ecology of Hybridization in Buckeye Butterflies (Lepidoptera: Nymphalidae). Berkeley: University of California, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHafernik, John E. Phenetics and Ecology of Hybridization in Buckeye Butterflies (Lepidoptera: Nymphalidae). University of California, 1982.
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