APA (7th ed.) Citation

Humboldt, F. E. A. (1849). Cosmos: A sketch of a physical description of the Universe. Henry G. Bohn.

Chicago Style (17th ed.) Citation

Humboldt, Federico Enrique Alejandro. Cosmos: A Sketch of a Physical Description of the Universe. London, England, United Kingdom: Henry G. Bohn, 1849.

MLA (9th ed.) Citation

Humboldt, Federico Enrique Alejandro. Cosmos: A Sketch of a Physical Description of the Universe. Henry G. Bohn, 1849.