APA (7th ed.) Citation

Guggenheim, H. F. (1930). The seven skies. G. P. Putnam.

Chicago Style (17th ed.) Citation

Guggenheim, Harry Frank. The Seven Skies. New York, London: G. P. Putnam, 1930.

MLA (9th ed.) Citation

Guggenheim, Harry Frank. The Seven Skies. G. P. Putnam, 1930.