Harbinger Companion with Study GuideAuthor: Jonathan CahnPublisher: Charimsa MediaPub. Date: Jan. 2013ISBN-13: 9781621362456Bestseller List AppearancesListMonthRankView Top 50 May 201339 View Top 50 Apr 201334 View Multichannel Apr 201316 View Multichannel Mar 201314 View Top 50 Mar 201333 View Top 50 Mar 201333 View