Just watched this video from a blog called Finger Toe that is absolutely worth 8 minutes of your life. If you need to, save it for Super Bowl Sunday and watch it instead of the commercials. (Notice the new "watch later" button at the bottom of the video?)
He mentions a book titled Evangelism and the Sovereignty of God by J.I. Packer. I read this little book a couple of years ago (during a summer vacation) and highly recommend it to anyone who has questions regarding God's sovereignty.