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.
Lua i Stíl Chicago (17ú heag.)Darwin, Charles, Paul H. Barrett, agus R. B. Freeman. The Geology of the Voyage of H. M. S. Beagle, Pt. 3: Geological Observations on South America. London: Pickering, 1986.
Lua MLA (8ú heag.)Darwin, Charles, et al. The Geology of the Voyage of H. M. S. Beagle, Pt. 3: Geological Observations on South America. Pickering, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.