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Gerard, Brady (Summer 1981). "The Extant Copies of the Irish 2d Coil of 1835 Perf 15 x Imperf (S.G. 74B) in unused condition". Irish Stamp News. 1 (8). Dublin: Ian Whyte (Ireland) Ltd. ISSN0332-317X. OCLC41167086.
Foley, Joe (Fall 2004). "The Rare 1934 2d Coil Stamp—Forgery". The Revealer. 54 (2). USA: Éire Philatelic Association: 20. ISSN0484-6125.