Darwin, C., Barrett, P. H., & Freeman, R. B. (1986). The geology of the voyage of H. M. S. beagle, pt. 3: Geological observations on South America. Pickering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDarwin, Charles, Paul H. Barrett, और R. B. Freeman. The Geology of the Voyage of H. M. S. Beagle, Pt. 3: Geological Observations on South America. London: Pickering, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDarwin, Charles, et al. The Geology of the Voyage of H. M. S. Beagle, Pt. 3: Geological Observations on South America. Pickering, 1986.
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