APA (7th ed.) Citation

Sheldon, S. (1991). The doomsday conspiracy. Harper Collins.

Chicago Style (17th ed.) Citation

Sheldon, Sidney. The Doomsday Conspiracy. London: Harper Collins, 1991.

MLA (8th ed.) Citation

Sheldon, Sidney. The Doomsday Conspiracy. Harper Collins, 1991.

Warning: These citations may not always be 100% accurate.