Crichton, M. (2011). Sphere (1st Harper ed.). Harpercollins.
Cita Chicago Style (17a ed.)Crichton, Michael. Sphere. 1st Harper ed. New York: Harpercollins, 2011.
Cita MLA (8a ed.)Crichton, Michael. Sphere. 1st Harper ed. Harpercollins, 2011.
Precaución: Estas citas no son 100% exactas.