Willcox, J. (1892). On the evolution of the earth and the heavenly bodies. S.l..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWillcox, Joseph. On the Evolution of the Earth and the Heavenly Bodies. S.l., 1892.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWillcox, Joseph. On the Evolution of the Earth and the Heavenly Bodies. S.l., 1892.
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