Tactics sells over 100,000 Units  Contact:  Casey Harrell Director, Corporate Communications tel:   615-902-1109 web: casey.harrell@harpercollins.com (Grand Rapids, MI) March 29, 2016– Zondervan is pleased to announce Tactics: A Game Plan for Discussing Your Christian Convictions by Greg Koukl has sold over 100,000 copies.  A book to help evangelicals communicate and defend the Christian message with confidence and grace has consistently gained the attention of church pastors and congregants since its release in 2009. Tactics is the first title for author Greg Koukl with Zondervan, and he…