And Some Evangelists by Roger Carswell and published by Christian Focus Publications.
Full of interesting stories and packed full of quotes from Godly men of past and present. It presents the case that Churches have neglected the calling and supporting of local evangelists. We have pastors, deacons, worship leaders, youth leaders, women's leaders etc, etc, but we don't have any evangelists. The verse he uses is Ephesians 4:11; that God gave some to be evangelists for the equipping of the saints for the work of the ministry. Here's one recommendation by Warren Wiersbe, "We've so emphasised pastors and teachers' that we've almost forgotten that Ephesians 4:11 also names evangelists. Roger Carswell challenges us to discover and develop evangelists in our churches."