APA
Crichton.M, . (1987). Sphere. New York: Ballantine Reference Library.
Chicago
Crichton.M, . 1987. Sphere. New York: Ballantine Reference Library.
Harvard
Crichton.M, . (1987). Sphere. New York: Ballantine Reference Library.
MLA
Crichton.M, . Sphere. New York: Ballantine Reference Library. 1987.
