The Chaucer Review: An Indexed Bibliography (Vols. 1-30)

Yamamoto, Dorothy. "'Noon oother incubus but he': Lines 878-81 in the Wife of Bath's Tale." 28 (1994): 275-78.
In medieval tradition meeting with an incubus resulted sometimes in pregnancy, but often in violence, as the story of a priest's daughter who meets an incubus in An Alphabet of Tales shows. The most likely meaning of the Wife's reference in lines 878-81 of her tale is that the incubi can do serious physical harm to women.