Παραπομπή APA

Sheldon, S. (2013). Doomsday conspiracy. Harper Collins.

Παραπομπή Chicago Style

Sheldon, Sidney. Doomsday Conspiracy. Uttar Pradesh: Harper Collins, 2013.

Παραπομπή MLA

Sheldon, Sidney. Doomsday Conspiracy. Harper Collins, 2013.