Citazione Stile APA (7a Edizione)

Silverberg, R. (1999). The Alien Years (1. pbk print.). HarperPrism.

Citazione stile Chigago Style (17a edizione)

Silverberg, Robert. The Alien Years. 1. pbk print. New York: HarperPrism, 1999.

Citatione MLA (9a ed.)

Silverberg, Robert. The Alien Years. 1. pbk print. HarperPrism, 1999.