Below are books that were helpful to me when I was preparing myself for work in global missions. There are many other newer books that could be added to this list, but I wanted to share the ones that impacted me personally when I first was starting out.
On Being a Missionary by Thomas Hale
Cross Cultural Conflict by Duane Elmer
Leading Cross Culturally by Sherwood G. Lingenfelteer
Communicating Christ Cross Culturally by David Hesselgrave
Perspectives on the World Christian Movement by Ralph D. Winter
Let the Nations Be Glad by John Piper
Eternity in Their Hearts by Don Richardson
From Jerusalem to Irian Jaya by Ruth Tucker
A Force in the Earth by David Shibley
Foxe’s Book of Martyrs by John Foxe
Operation World by Patrick Johnstone
Serving As Senders by Neal Pirilo
Missionary Methods: St. Paul’s or Ours by Rolland Allen
The Planting of Missionary Churches by John Nevius
Appropriate Christianity by Charles Kraft
LAMP: Language Acquisition Made Practical by Thomas and Elizabeth Brewster
Spiritual Leadership by J. Oswald Sanders
The Heavenly Man by Bro. Yun and Paul Hattaway
Church Planting Movements: How God is Redeeming a Lost World by David Garrison
And the best 4 Fields Plan for CPM: