Gruss, E. C. (1994). The ouija board: A doorway to the occult (ed.). P & R publishers.
Lua i Stíl Chicago (17ú heag.)Gruss, Edmond C. The Ouija Board: A Doorway to the Occult. ed. New Jersey: P & R publishers, 1994.
Lua MLA (9ú heag.)Gruss, Edmond C. The Ouija Board: A Doorway to the Occult. ed. P & R publishers, 1994.
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