Bringhurst, Robert. The Elements of Typographic Style. 2nd. Ed. Point Roberts, WA: Hartley & Marks, 1997.

Clayton, Ewan, "The Inscriptions of David Jones" in David Jones: Diversity in Unity. Eds. Belinda Humphrey and Anne Price-Owen. Cardiff: University of Wales Press, 2000.

Crossley, Harold. Lettering in Stone. The Author, 1991.

Drucker, Johanna. The Alphabetic Labyrinth: The Letters in History and Imagination. London: Thames and Hudson, 1995.

Gill, Eric. On Typography. Introd. Christopher Skelton. London: Lund Humphries, [1931] 1998.

Gray, Nicolete. The Painted Inscriptions of David Jones. London: Gordon Fraser, 1981.

Higgins, Dick. Pattern Poetry: Guide to and Unknown Literature. Albany: State University of New York Press, 1987.

Huws, Daniel. Medieval Welsh Manuscripts. Aberystwyth: University of Wales Press and the National Library of Wales, 2000.

Jarman, A. O. H., Gol. Llyfr Du Caerfyrddin, gyda Rhagymadrodd, Nodiadau Testunol, a Geirfa. Caerdydd: Gwasg Prifysgol Cymru, 1982.

Johnston, Edward. Writing, Illuminating, and Lettering. London: John Hogg, 1906.

Jones, David. Correspondence: Nancy Sanders, NLW Ms. 23238E; Saunders Lewis, NLW 21818E, NLW Ms 22724D; T. H. Parry-Williams, David Jones Papers, Box II:28.

Jones, Huw Ceiriog. The Library of David Jones (1895-1974): A Catalogue. Aberystwyth: National Library of Wales, 1995.

Jones, Thomas. "The Black Book of Carmarthen 'Stanzas of the Graves'" The John Rhys Memorial Lecture. Proceedings of the British Academy. 1967.

Kindersley, David. Mr. Eric Gill. Book Club of California, 1967.

Miles, Jonathan. Eric Gill and David Jones at Capel-y-ffin. Borderline Series. Ed. John Powell Ward. Bridgend, Mid-Glamorgan: Seren Books, 1992.

Morrison, Stanley. First Principles of Typography. New York: MacMillan, 1936.

Nash-Williams, V.E. The Early Christian Monuments of Wales. Cardiff: University of Wales Press, 1950.

Pease, David, ed. Eric Gill: The Inscriptions, A descriptive catalogue. Boston: Godine, 1995.

Petrucci, Armando. Writing the Dead: Death and Writing Strategies in the Western Tradition. Trans. Michael Sullivan, Stanford: Stanford University Press, 1998.

Rasula, Jed, and Steve McCafferty, eds. Imagining Language: An Anthology. Cambridge, Mass. MIT Press, 1998.

Thomas, Charles. And Shall These Mute Stones Speak? Post-Roman Inscriptions in Western Britain. Cardiff: University of Wales Press, 1994.

Tschichold, Jan. The New Typography. Trans. Ruari McClean. Introd. Robin Kinross. Berkeley: University of California Press, [1928] 1995.

Tufte, Edward. Envisioning Information. Cheshire, Conn.: Graphics Press, 1990.
---. The Visual Display of Quantitative Information. Cheshire, Conn.: Graphics Press, 1983.
---. Visual Explanations. Cheshire, Conn.: Graphics Press, 1997.