Stifter, David (2009). "4. Early Irish". In Ball, Martin J.; Müller, Nicole (eds.). The Celtic Languages (2nd ed.). London; New York: 2009. p. 55. ISBN978-0-415-42279-6.
Scannell, Kevin (May 2020). "Neural Models for Predicting Celtic Mutations". Proceedings of the 1st Joint Workshop on Spoken Language Technologies for Under-resourced Languages (SLTU) and Collaboration and Computing for Under-Resourced Languages (CCURL): 1–8. ISBN9791095546351 – via ACL Anthology.
Dubach Green, Antony (1996). "Some effects of the Weight-to-Stress Principle and grouping harmony in the Goidelic languages". Working Papers of the Cornell Phonetics Laboratory. 11: 117–155. CiteSeerX10.1.1.387.8008.
McManus (1988), pp. 163–165. McManus, Damian (1988). "Irish letter-names and their kennings". Ériu. 39: 127–168. ISSN0332-0758.
Ó Cróinín, Dáibhí. (1995). Early medieval Ireland, 400-1200. London: Longman. p. 44. ISBN0-582-01566-9. OCLC31608471.
Thurneysen, Rudolf (1993). A grammar of Old Irish (Rev. and enl. ed. with suppl ed.). [Dublin]: School of Celtic Studies, Dublin Institute for Advanced Studies. pp. 58–59. ISBN1-85500-161-6. OCLC31459157.