Arm – Óglaigh na hÉireann – use on the official website of the Irish Defence Forces, retrieved 29 November 2006.
qub.ac.uk
edil.qub.ac.uk
C. Marstrander, E. G. Quin et al., editors (1913–76), “óclach”, in Dictionary of the Irish Language: Based Mainly on Old and Middle Irish Materials, Dublin: Royal Irish Academy,