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APA-referensHagen, V. W. v. (1949). South America called them: Explorations of the great naturalists : Charles-Marie de la Condamine : Alexander von Humboldt : Charles Darwin : Richard Spruce.
Chicago-stil citatHagen, Victor Wolfgang von. South America Called Them: Explorations of the Great Naturalists : Charles-Marie De La Condamine : Alexander Von Humboldt : Charles Darwin : Richard Spruce. London, 1949.
MLA-referensHagen, Victor Wolfgang von. South America Called Them: Explorations of the Great Naturalists : Charles-Marie De La Condamine : Alexander Von Humboldt : Charles Darwin : Richard Spruce. 1949.
Harvard-stil citatHagen, V. W. v. 1949. South America called them: Explorations of the great naturalists : Charles-Marie de la Condamine : Alexander von Humboldt : Charles Darwin : Richard Spruce. London.
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