Olson, C. Gordon. What in the world is God doing? : the essentials of global missions : an introductory guide / C. Gordon Olson. - Cedar Knolls, NJ. : Global Gospel Publishers, c1988. - 318 p. : ill., maps. Includes bibliographical references (p. 301-304) and index. ISBN: 0962485004 Subjects--Topical Terms: Missions. Dewey Class. No.: 266 Ols 1988