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Tom Current, Handbook of British Philately, Part 1, section 1-Identification of line engraved stamps 1840-79, Lord Byron Stamps, Portland, Oregon, 1980
H. Dagnall, John Dickinson and his Silk-Thread Paper, The Author, Leicester, 1975
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J. W. W. Stone, The Repairs of the 1841 One Penny Plates 1-40, R.C. Alcock Ltd., Cheltenham, 1974
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The
History of the Adhesive Stamps of the British Isles available for Postal
and Telegraph Purposes, Philatelic Society, London, 1899 (Supplement
published in 1903)