Chicago: Charles Darwin, "Editorial Note.," Geological Observations on South America, ed. Bryant Conant, James and trans. Babington, B. G. (Benjamin Guy), 1794-1866 in Geological Observations on South America Original Sources, accessed February 15, 2025, http://www.originalsources.com/Document.aspx?DocID=JSZZHFME3MK3LUY.
MLA: Darwin, Charles. "Editorial Note." Geological Observations on South America, edited by Bryant Conant, James, and translated by Babington, B. G. (Benjamin Guy), 1794-1866, in Geological Observations on South America, Original Sources. 15 Feb. 2025. http://www.originalsources.com/Document.aspx?DocID=JSZZHFME3MK3LUY.
Harvard: Darwin, C, 'Editorial Note.' in Geological Observations on South America, ed. and trans. . cited in , Geological Observations on South America. Original Sources, retrieved 15 February 2025, from http://www.originalsources.com/Document.aspx?DocID=JSZZHFME3MK3LUY.