APA (7th ed.) Zitazioa

Alexander von Humboldt. (2007). Jahresbericht-Annual Report 2007. Himboldt-foundation.

Chicago Style (17th ed.) Zitazioa

Alexander von Humboldt. Jahresbericht-Annual Report 2007. Bonn: Himboldt-foundation, 2007.

MLA (9th ed.) Zitazioa

Alexander von Humboldt. Jahresbericht-Annual Report 2007. Himboldt-foundation, 2007.