Darwin, C., Sowerby, G. B., & Lonsdale, W. (1900). Geological observations on the volcanic islands and parts of South America. D. Appleton and company.
Chicago Style (17th ed.) CitationDarwin, Charles, George Brettingham Sowerby, and W. Lonsdale. Geological Observations on the Volcanic Islands and Parts of South America. New York, London: D. Appleton and company, 1900.
MLA (9th ed.) CitationDarwin, Charles, et al. Geological Observations on the Volcanic Islands and Parts of South America. D. Appleton and company, 1900.
Warning: These citations may not always be 100% accurate.