1. The Angels and Us;Adler,1982
2. The New Whole Duty of Man, Containing the Faith as Well as Practice of a Christian;Allestree,1810
3. Diagnostic and Statistical Manual of Mental Disorders: DSM-5,2013
4. Three Crucial Questions about Spiritual Warfare;Arnold,1997
5. Fallen Angels: Soldiers of Satan’s Realm;Bamberger,1952