APA (7th ed.) Citation

Botting, D. (1973). Humboldt and the cosmos / Douglas Botting. Sphere Books.

Chicago Style (17th ed.) Citation

Botting, Douglas. Humboldt and the Cosmos / Douglas Botting. London: Sphere Books, 1973.

MLA (9th ed.) Citation

Botting, Douglas. Humboldt and the Cosmos / Douglas Botting. Sphere Books, 1973.

Warning: These citations may not always be 100% accurate.