Thomas Ihde, Máire Ní Neachtain, Roslyn Blyn-LaDrew, John Gillen (2008) Colloquial Irish: The Complete Course for Beginners, Routledge, published 2015, →ISBN, page 191
Kuninao Nashimoto (2020 March) ニューエクスプレスプラス アイルランド語 [New Express Plus Irish] (in Japanese), Tokyo: Hakusuisha, →ISBN, pages 17-19