Alexander von Humboldt. From the Americas to the Cosmos. Coordinated by: Raymond Erickson, Mauricio A. Font, Brian Schwartz. Part IV: Life and Travels. Chapter 27. New York: Bildner Center for Western Hemisphere Studies 2004, 343-352.
https://www.gc.cuny.edu/CUNY_GC/media/CUNY-Graduate-Center/PDF/Centers/Bildner%20Center%20for%20Western%20Hemisphere%20Studies/Publications/Gerould27.pdf
Gerould, Daniel: Witkiewicz and the Course of Mid-Eastern History, in: Alexander von Humboldt. From the Americas to the Cosmos. Coordinated by: Raymond Erickson, Mauricio A. Font, Brian Schwartz. Part IV: Life and Travels. Chapter 27. New York: Bildner Center for Western Hemisphere Studies 2004, 343-352.
https://www.gc.cuny.edu/CUNY_GC/media/CUNY-Graduate-Center/PDF/Centers/Bildner%20Center%20for%20Western%20Hemisphere%20Studies/Publications/Gerould27.pdf
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