APA (7th ed.) Citation

Ley, W. (1941). The lungfish and the unicorn: An excursion into romantic zoology. Modern age books.

Chicago Style (17th ed.) Citation

Ley, Willy. The Lungfish and the Unicorn: An Excursion into Romantic Zoology. New York: Modern age books, 1941.

MLA (8th ed.) Citation

Ley, Willy. The Lungfish and the Unicorn: An Excursion into Romantic Zoology. Modern age books, 1941.