23Hull, Eleanor. "The Black Pig of Kiltrustan." Folklore 29.3 (1918): 228-30.
The author asserts that "The re-appearance of the Black Pig at this moment appears to be by no means an accidental occurrence. The so-called Prophecy of St. Columcille, to which reference is made, is a long, ill-written, and quite recent prose tract which has been widely circulated and is firmly believed in the North of Ireland."