Botting, D. (1973). Humboldt and the cosmos / Douglas Botting. Sphere Books.
Chicago Edition CitationBotting, Douglas. Humboldt and the Cosmos / Douglas Botting. London: Sphere Books, 1973.
MLA Edition CitationBotting, Douglas. Humboldt and the Cosmos / Douglas Botting. Sphere Books, 1973.
Warning: These citations may not always be 100% accurate.