Run with the Vision: The Impact of the Unreached People Groups Concept on Students, Churches and Sending Agencies
By Greg Parsons
Foundations of Frontier Missiology: Core Understandings and Interrelated Concepts
By Alan R. Johnson
The People Group Approach: A Historical Perspective
By David E. Datema and Leonard N. Bartlotti
A Biblical Understanding of People Groups
By Steve Hawthorne
Rethinking People Group Missiology
By Rethinking People Groups Forum team