Cita APA (7th ed.)
Sheldon, S. (1991). The doomsday conspiracy. Morrow.
Cita Chicago (17th ed.)
Sheldon, Sidney. The Doomsday Conspiracy. New York: Morrow, 1991.
Cita MLA (9th ed.)
Sheldon, Sidney. The Doomsday Conspiracy. Morrow, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.