Kim, Samuel I., The Unfinished Mission in Thailand: The Uncertain Christian Impact on the Buddhist Heartland, Seoul: East-West Center for Missions Research and Development, 1980
There are not too many books on the history of the church in Thailand and my most common go-to books are S.G. McFarland’s Historical Sketch of Protestant Missions 1828-1928 and Alex Smith’s Siamese Gold, which brings the story of the Thai church up to 1982. Both books, however, do a better job with chronicling earlier Thai church history (pre-WWII) than post-war. Truth be told, Smith’s book does cover the post-war period, though he provides more information on evangelical missions working apart from the Church of Christ in Thailand (CCT) than he does the CCT itself. Kenneth Wells’ History of Protestant Work in Thailand, 1828-1958 is somewhat useful if you want an official sanitized version of the American Presbyterian Mission and CCT in the post-war period but if you compare Wells’ book with Samuel Kim’s The Unfinished Mission in Thailand: The Uncertain Christian Impact on the Buddhist Heartland, it becomes immediately obvious that there is a lot of dirty laundry that Wells left out.
Samuel Kim begins his book with a couple of general chapters discussing Thailand, Buddhism, and the history of Christian missions in Thailand up through WWII, most of which you can easily find in the other books I’ve just mentioned. However, beginning with chapter 3, he begins discussing tensions between the American Presbyterian missionaries and Thai Christians leaders after World War II up through the late 1970s. It is this second part of the book that is the most valuable and forms Kim’s unique contribution to understanding the history of Christianity in Thailand.