c. 815-840, “The Monastery of Tallaght”, in Edward J. Gwynn, Walter J. Purton, transl., Proceedings of the Royal Irish Academy, volume 29, Royal Irish Academy, published 1911-1912, pages 115-179:

Used to quote from the ninth-century Tallaght Memoir, written in Old Irish and surviving in a 15th-century manuscript. This edition is abbreviated Mon. Tall. in DIL. It takes a single optional parameter.

Indicates which paragraph in the Memoir a quote is located in.