Zwemer, Samuel M. (1939): «5». Studies in Popular Islam: Collection of Papers dealing with the Superstitions and Beliefs of the Common People. London: Sheldon Press.
Kramer, Heinrich & Sprenger, James (1486): Summers, Montague (oversetter – 1928): The Malleus Maleficarum, Del 2, kapittel VIII, «Certain Remedies prescribed against those Dark and Horrid Harms with which Devils may Afflict Men», hos Sacred-texts.com