APA (7th ed.) Citation

Asimov, I., Pohl, F., & Broun, H. H. (1972). Science fiction, the early days. Jeffrey Norton.

Chicago Style (17th ed.) Citation

Asimov, Isaac, Federick Pohl, and Heywood Hale Broun. Science Fiction, the Early Days. New York: Jeffrey Norton, 1972.

MLA (8th ed.) Citation

Asimov, Isaac, et al. Science Fiction, the Early Days. Jeffrey Norton, 1972.