Cosmos : a sketch of a physical description of the universe

MLA

Humboldt, Alexander von, et al. Cosmos : a sketch of a physical description of the universe. London : H.G. Bohn, 1849-1858.

APA

Humboldt, A., Otté, E., Paul, B. & Dallas, W. (1849). Cosmos : a sketch of a physical description of the universe. London : H.G. Bohn.

Chicago

Humboldt, Alexander von, E. C. Otté, B. H. Paul and W. S. Dallas. Cosmos : a sketch of a physical description of the universe. London : H.G. Bohn, 1849-1858.