TCG Letter #485 / Carpenter Letter #290a

Vector (Journal of the British SF Association), #67/68, Spring 1974, p. 9

Wade Center collection., Original letter

Marquette archive details., See 7/1/10 (photocopy and transcript)

The J.R.R. Tolkien Companion and Guide - Chronology (2017), p. 714

Cartas de J.R.R. Tolkien, p. 530

The Annotated Hobbit (1988), p. 111

The Annotated Hobbit: Revised and Updated, pp. 146-7

"The Other Letters of J.R.R. Tolkien", compiled by Jorge Quinonez (early 1990s), pp. 6-7

The Letters of J. R. R. Tolkien: Revised and Expanded ed. (HarperCollins, UK), p. 521