APA (7th ed.) Citation

Sheldon, S. (1991). The Doomsday conspiracy. HarperCollins.

Chicago Style (17th ed.) Citation

Sheldon, Sidney. The Doomsday Conspiracy. London: HarperCollins, 1991.

MLA (9th ed.) Citation

Sheldon, Sidney. The Doomsday Conspiracy. HarperCollins, 1991.

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