TCG Letter #1114

Tolkien and the Great War, p. 28 (quoted)

The J.R.R. Tolkien Companion and Guide - Chronology (2017), pp. 37-8 (summary) (The T.C.B.S. was began during the Summer term 1911 at King Edward School. See various entries re. T.C.B.S. and TCBS.)

The J.R.R. Tolkien Companion and Guide - Reader's Guide Part 2 (2017), pp. 1281-88 (entry for T.C.B.S.)