Sorre, M. (1961). Alexandre de Humboldt, 1769-1859. [publisher not identified].
Chicago Style (17th ed.) CitationSorre, Maximilien. Alexandre De Humboldt, 1769-1859. Paris: [publisher not identified], 1961.
MLA (9th ed.) CitationSorre, Maximilien. Alexandre De Humboldt, 1769-1859. [publisher not identified], 1961.
Warning: These citations may not always be 100% accurate.