<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Ferguson, Samuel </hi> (1864): Account of Ogham Inscriptions in the Cave at Rathcroghan, County of Roscommon. in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Proceedings of the Royal Irish Academy (1836-1869)</hi> 9: 160-170.