Simpson, G. G. (1953). The major features of evolution. Columbia University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSimpson, George Gaylord. The Major Features of Evolution. New York: Columbia University Press, 1953.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSimpson, George Gaylord. The Major Features of Evolution. Columbia University Press, 1953.
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