Cita APA (7th ed.)

Eddison, E. R. (1967). The worm Ouroboros. Ballentine Books.

Cita Chicago (17th ed.)

Eddison, E. R. The Worm Ouroboros. New York: Ballentine Books, 1967.

Cita MLA (8th ed.)

Eddison, E. R. The Worm Ouroboros. Ballentine Books, 1967.