Cita APA (7a ed.)

Crichton, M. (1987). Sphere: A novel. Knopf.

Cita Chicago Style (17a ed.)

Crichton, Michael. Sphere: A Novel. New York: Knopf, 1987.

Cita MLA (8a ed.)

Crichton, Michael. Sphere: A Novel. Knopf, 1987.