Alexander von Humboldt. (2007). Jahresbericht-Annual Report 2007. Himboldt-foundation.
Tohutoru Kātū Chicago (17th ed.)Alexander von Humboldt. Jahresbericht-Annual Report 2007. Bonn: Himboldt-foundation, 2007.
Tohutoro MLA (9th ed.)Alexander von Humboldt. Jahresbericht-Annual Report 2007. Himboldt-foundation, 2007.
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