Study Guide and DVD now available for bestselling Tactics by master apologist Gregory Koukl Introduces Believers to Effective Ways to Defend Their Christian Faith Grand Rapids, Mich., May 5, 2017 — Since its release in 2009, Tactics: A Game Plan for Discussing Your Christian Convictions by apologist and radio host Gregory Koukl has engendered a devoted following and has sold over 100,000 copies. Now Zondervan has partnered with Koukl to create the Tactics Study Guide with DVD (on sale May…