L. W. Cushman 
The Devil and the Vice in the English Dramatic Literature Before Shakespeare [EPUB ebook] 

Originally published in 1900, this book was the first investigation of the devil and the Vice as dramatic figures, and a study of these figures led to a new view of the subject: it is, in brief, that the appearance of the devil in the non-dramatic as well as in the dramatic literature is limited to a definite range. As a dramatic figure the devil falls more and more into the background and the Vice is distinct in origin and function from the devil.