Citazione Stile APA (7a Edizione)

Asimov, I. (1989). Frontiers: New discoveries about man and his planet, outer space, and the universe. Plume.

Citazione stile Chigago Style (17a edizione)

Asimov, Isaac. Frontiers: New Discoveries About Man and His Planet, Outer Space, and the Universe. New York: Plume, 1989.

Citatione MLA (9a ed.)

Asimov, Isaac. Frontiers: New Discoveries About Man and His Planet, Outer Space, and the Universe. Plume, 1989.