APA (7th ed.) Citation

Doukan, G. (1958). The world beneath the waves. J. De Graff.

Chicago Style (17th ed.) Citation

Doukan, Gilbert. The World Beneath the Waves. New York: J. De Graff, 1958.

MLA (9th ed.) Citation

Doukan, Gilbert. The World Beneath the Waves. J. De Graff, 1958.