David Belden wrote a thesis on Buchman and his work at Oxford for his doctorate, in 1976. This important work was never published, and can now be read here for the first time. In a preface, which you can find here, I explain why this is well-worth reading.
David Belden, in an author’s preface, makes some very pertinent points on the relevance of Buchman and his work: "Re-reading this thesis I am both glad and sad to realize it is still one of the best things written about one of the most interesting movements of the 20th Century. Glad, because I think most of my judgments have worn well. Sad, because long before now there should have been a considerable academic industry analyzing the Oxford Group / Moral Re-Armament."