Παραπομπή APA

Helferich, G. (2005). Humboldt's cosmos : =: Alexander von Humboldt and the Latin American journey that changed the way we see the world. New York: Gotham Books.

Παραπομπή Chicago Style

Helferich, Gerard. Humboldt's Cosmos : =: Alexander Von Humboldt and the Latin American Journey That Changed the Way We See the World. New York: Gotham Books, 2005.

Παραπομπή MLA

Helferich, Gerard. Humboldt's Cosmos : =: Alexander Von Humboldt and the Latin American Journey That Changed the Way We See the World. New York: Gotham Books, 2005.

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