APA (7th ed.) Citation

Ley, W. (1941). The days of creation. Modernage books.

Chicago Style (17th ed.) Citation

Ley, Willy. The Days of Creation. New York: Modernage books, 1941.

MLA (9th ed.) Citation

Ley, Willy. The Days of Creation. Modernage books, 1941.

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