Líon alt a bhfuil an ghné seo luaite iontu: 2
Deir James Maher (Romantic Slievenamon..., 1954): ‘The “onlie begetter” of Knocknagow was the author’s kinsman, Colonel John O’Mahony, who suggested to Charles that he should write something for an American magazine called The Emerald ...’
McCarthy in Romantic Slievenamon in History, Folklore and Song: a Tipperary Anthology, 1954 in eagar ag James Maher; ag Eoghan Ó Néill in Gleann an Óir: Ar thóir na Staire agus na Litríochta in Oirthear Mumhan agus i nDeisceart Laighean, 1988