The Essentials of Global An Introductory Guide (5TH ed.). Veteran missionary and missiologist C. Gordon Olson has distilled his knowledge and experience to produce an introductory text to missions that is marked by its balance between theory and practice.
This book stresses the need for world evangelism. This is long read and seems a bit unorganized in thought. There are a whole lot of figures and statistics. The information and the stress for the need is solid. I didn't enjoy reading this book but I am still glad I did.