Cita APA (7th ed.)
Wulf, A., & Melcher, L. The Adventures of Alexander von Humboldt. Pantheon Books.
Cita Chicago (17th ed.)
Wulf, Andrea, i Lillian Melcher. The Adventures of Alexander Von Humboldt. Nueva York, EUA: Pantheon Books.
Cita MLA (9th ed.)
Wulf, Andrea, i Lillian Melcher. The Adventures of Alexander Von Humboldt. Pantheon Books.
Atenció: Aquestes cites poden no estar 100% correctes.