Pritchard Telfryn. Cummian's Letter De controversia paschali. Edited by Maura Walsh and Dáibhi Ó Cróinín. Together with a Related Irish Computistical Tract «De ratione conputandi». Edited by Dáibhi Ó Cróinín. 1988. In: Scriptorium, Tome 43 n°1, 1989. pp. 169-172.
Pritchard Telfryn. Notes on a Manuscript of Walter of Chatillon's Alexandreis from an Illustrious Welsh Library . In: Scriptorium, Tome 41 n°1, 1987. pp. 105-113.
Pritchard Telfryn. R. B. Marks. The Medieval Manuscript Library of the Charterhouse of St. Barbara in Cologne (Analecta Cartusiana, 22). In: Scriptorium, Tome 30 n°2, 1976. p. 313.