^ Ó Searcaigh, Séamus (1925), Foghraidheacht Ghaedhilge an Tuaiscirt [Pronunciation of Northern Irish][1] (in Irish), Béal Feirste [Belfast]: Brún agus Ó Nualláin [Browne and Nolan], section 39, page 18
A. Palandri, Ú. Bhreathnach, M. Měchura, G. Ó Cleircín, and B. Ó Raghallaigh, (2026), “dumhach”, in Taisce Chanúintí na Gaeilge - Repository of Irish Dialects[2] (in Irish and English), Dublin City University
Dinneen, Patrick S. (1927), “duṁaċ”, in Foclóir Gaeḋilge agus Béarla [Irish and English Dictionary], 2nd edition, Dublin: Irish Texts Society, page 380; reprinted with additions 1996, →ISBN