A Certain Sound, A Primer on Open Air Preaching by Ryan Denton & Scott Smith and published by Reformation Heritage Books.
“A Certain Sound is a well-written, carefully crafted, scripturally saturated book that was a joy to read. As one who has many years’ experience with open air preaching, I thank God for this stirring call to the church to fulfill one of her main duties—namely, preaching Jesus ‘to every creature.’ Read this book. Master it. And with the help of the Holy Spirit, let the ‘certain sound’ of the glorious gospel of Christ be heard outdoors once again.”