Judson. Darwin's On the Origin of Species. Indiana University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJudson. Darwin's On the Origin of Species. Indiana University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJudson. Darwin's On the Origin of Species. Indiana University Press.
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