APA (7th ed.) Citation

Wolf, F. A. (1988). Parallel universes: The search for other worlds. Simon and Schuster.

Chicago Style (17th ed.) Citation

Wolf, Fred Alan. Parallel Universes: The Search for Other Worlds. New York u.a: Simon and Schuster, 1988.

MLA (9th ed.) Citation

Wolf, Fred Alan. Parallel Universes: The Search for Other Worlds. Simon and Schuster, 1988.