Darwin, C., Barrett, P. H., & Freeman, R. B. (1986). The geology of the voyage of H. M. S. beagle, Pt. 2: Geological observations on the volcanic islands. 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. 2: Geological Observations on the Volcanic Islands. London: Pickering, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDarwin, Charles, et al. The Geology of the Voyage of H. M. S. Beagle, Pt. 2: Geological Observations on the Volcanic Islands. Pickering, 1986.
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