Influence: Masting Life's Most Powerful Skill Course Guidebook By Kenneth Brown Books / Paperback Body, Mind, Spirit › Self-Help Publisher: The Teaching Company, January 2013 Price $19.96 Free Shipping Send to a friend Used - Acceptable Acceptable condition. Course Guidebook. (Communication Skills) $19.96 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.