I like the Four Views books as they provide a brief but helpful analysis of the major points of view (and points of disagreement) on various theological topics. The latest such volume is Understanding Spiritual Warfare (Baker Academic), featuring essays by Walter Wink (the World Systems Model), David Powlison (the Classical Model), Gregory Boyd (the Ground-Level Deliverance Model) and C. Peter Wagner and Rebecca Greenwood (the Strategic-Level Deliverance Model). The book offers a useful introduction to this controversial topic.
