Ó Cathasaigh T. Gat and Díberg in Togail Bruidne Da Derga // Celtica Hels-ingiensia / Ed. A. Ahlqvist (Proceedings from a symposium on Celtic Studies; Commentationes Humanarum Litterarum 107). Helsinki, 1996. Ó Concheanainn T. The Three Forms of Dinnshenchas Érenn // The Journal of Сeltic Studies, 3, 1981–1982.

O’Connor R. The Destruction of Da Derga’s Hostel. Kingship and Narrative Artistry in a Mediaeval Irish Saga. Oxford, 2013.

Ó Corráin D. Ireland c. 800: aspects of society // A new history of Ireland. Vol. 1. Oxford, 2005.

Ó Cróinín D. Early Medieval Ireland. London, New York, 1995.

Ó Cróinín D. The oldest Irish names for the days of the week? // Ériu, 32, 1981. O’Curry E. Lectures on the manuscript materials of ancient Irish history. Dub-lin, 1861. Ó Fiaich T. Cérbh é Ninine Éigeas? // Seanchas Ardmhacha 4(2), 1961/1962.

Ó hÓgáin D. An File. Baile Átha Cliath, 1982.

Ó hÓgáin D. The Lore of Ireland. An Encyclopedia of Myth, Legend and Romance. Cork, 2006.

O’Kelly M. J. Newgrange: Archaeology, Art and Legend. London, 1982.