Alexander von Humboldt – Personal Narrative of Travels to the Equinoctial Regions of the New Continent during the Years 1799–1804 (first edition in French, seven volumes up to 1826)
↑ Sutherland, John; Fender, Stephen (2011). "15 June". Love, Sex, Death & Words: surprising tales from a year in literature. London: Icon. pp.228–9. ISBN978-184831-247-0.
↑ Warner, Charles Dudley. Library of the World's Best Literature, Ancient and Modern. United States: J. A. Hill, 1902. Page 377
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