i do apologize i have been off the b for some time--but on angels Renald showers is pretty good--on demons--"in the name of Jesus: exorcism among early Christians" by graham twelftree & "powers of evil: a biblical study of satan & demons" by sydney ht page is good-while i don't agree with every word these men write on the subject--they are overall the best u can buy at this time--if ud like i can email u some journal articles--just let me know--God bless