Cokayne, G. E., ed. (1893). Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct, or dormant (L to M). Vol. 5 (1st ed.). London: George Bell & Sons. p. 82, line 5]: "Thomas (Dongan) EARL OF LIMERICK &c. [I.], yr. br. of the above earl. and on whom this Earldom and the Viscountcy of Dongan of Clane were entailed under the spec. rem. in their respective creations, was b. 1654 and appears, notwithstanding the attainder of 1691, to have assumed in 1698 and been generally allowed the peerage [I.]."{{cite book}}: CS1 maint: postscript (link)
dib.ie
Ó Ciardha, Éamonn (October 2009). "Dongan, William". Dictionary of Irish Biography. Retrieved 1 February 2023.