Cita APA (7th ed.)
Gruss, E. C. (1994). The Ouija board: A doorway to the occult. P&R Pub..
Cita Chicago (17th ed.)
Gruss, Edmond C. The Ouija Board: A Doorway to the Occult. Phillipsburg, N.J.: P&R Pub., 1994.
Cita MLA (9th ed.)
Gruss, Edmond C. The Ouija Board: A Doorway to the Occult. P&R Pub., 1994.
Atenció: Aquestes cites poden no estar 100% correctes.