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