Maynooth: Department of Old and Middle Irish, St. Patrick's College, 1996. — 195 p.
The Phonology and Orthography of the Attested Celtic Languages
From Proto-Indo-European to Proto-Celtic
The Voiceless Labiovelar, Syllabic Nasals, Lenition and the Celtic Family Tree
Primitive Irish
From Early Old Irish to Middle Irish
The Great British Vowel Shift