McManus, Damian (1988). "Irish Letter-Names and Their Kennings". Ériu. 39: 127–168. JSTOR30024135.
McManus, Damian (1988). "Irish Letter-Names and Their Kennings". Ériu. 39: 127–168. JSTOR30024135.
vanhamel.nl
Schrijver, Peter (2015). "The meaning of Celtic *eburos". In Oudaer, Guillaume; Hily, Gaël; Le Bihan, Hervé (eds.). Mélanges en l'honneur de Pierre-Yves Lambert. Rennes: TIR. pp. 65–76.