³O'Donovan, John, Michael Herity, and David McGuinness. Ordnance Survey Letters, Sligo: Letters Relating to the Antiquities of the County of Sligo Containing Information Collected during the Progress of the Ordnance Survey in 1836 and 1837. Dublin: Fourmasters, 2010. 137.
Letter, to Lieut. Thomas A. Larcom, Superintendent of the Ordnance Survey, from George Petrie, head of the Survey's Topographical Section, written from Rathcarrick, Co. Sligo, concerning his examination of sites of archaeological interest in the county, with particular reference to the 'sepulchral circles' and cromleacs at Carrowmore, Kilmacowen, Co. Sligo. 12 August 1837.
William Wakeman wrote of the Tobernaveen Stone, "Unquestionably some of the holed-stones are of doubtful character, inasmuch as they may be classified either as prehistoric, or belonging to an early period of Christianity. We may perhaps assign to one of the finest monuments of this class remaining in Ireland a degree of antiquity equal at least to that acknowledged to be possessed by the cromlechs, circles, and other megaliths of Carrowmore, immediately adjoining." (Wakeman, William F., and John Cooke. Wakeman's Handbook of Irish Antiquities. Dublin: Hodges, Figgis, 1903. 18-19.)