 It's real!Not just from some movie

There are two sources for the text Gardner used to make this chant.The opening lines, with their repeated "Eko eko" refrain, apparently come from an article published in a 1921 edition of the journal "Form" by J. F. C. Fuller, on "The Black Arts", reprinted in "The Occult Review" in April 1926, though "The Occult Review" 1923 is frequently mis-cited.