Townsend wrote Satan and Demons, and its 12 chapters deals with Demonism in the Bible (both Satan and his demons). It explains demon possession and some practical points of God allowing Demons on mankind like a disease.
Life and Times takes Jesus the Messiah, and examines the New Testament teaching in light of Jewish history and culture
Dehaan Angels and Demons: Their Nature, Origin, Ministry, and Classification is a very short book of 4 chapters on different points on angels and demons.
McRae Lectures on Satan is an 11 chapter work on the basic facts of Satan, sin, power of Satan and his demons, etc.
Bounds, in Satan, His Personality Power and Overthrow, shows with irrefutable logic backed by the testimony of Holy Scripture, that the Arch Enemy of mankind to be a Person— actual, literal, ever active for the destruction of human souls. Indicates whereby Christian believers can withstand his assaults and how they may finally triumph.
Bragg Angelology Systematic Theology by E.C. Bragg (Trinity College) is a set of classes notes apparently on angels. He is brief but has good material.
This work of 31 chapters is simply different chapters of experiences by missionaries and others with demonic activity from different countries around the world. Some chapters are Modern Demon Posession, Demonology, Saved and Delivered, Relpase? Under the curse, etc.