See also references for related subjects.
Kenney, James F., “Chapter VI: The expansion of Irish Christianity”, in: Kenney, James F., The sources for the early history of Ireland: an introduction and guide. Volume 1: ecclesiastical, Records of Civilization: Sources and Studies 11, Revised ed. (1929), New York: Octagon, 1966. 486–621.
536  “Josephus Scottus: Poems A.D. 782 x 796”