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Perfins

Burkhart BEER and Maurice HARP, Pilfering, Protection and Perfins: An Aspect of the Line-Engraved Twopence. Dusseldorf, Germany: Briefmarkenfreunde Dsseldorf, 1996.

Tony EDWARDS and B. C. LUCAS, G.B. Official Perfins. Northwood, Middlesex: The Perfin Society, 1984. 69pp.

Tony EDWARDS, The Tomkins Catalogue of Identified G.B. Perfins. 167pp.

Roy GAULT, The Perfin Society Catalogue of Sloper's Wartime Provisionals.

--- The Perfin Society Catalogue of G.B. Perfins - Illustrated Catalogue Updates 1993. The Perfin Society, 1993.

--- The Tomkins Catalogue of Identified G.B. Perfins. 7th edition The Perfin Society, 1993.

Ian HAMILL and Roy GAULT, Great British Perfins found on King George V Seahorses 1913-1939. 2nd edition Orpington: Perfin Society, 2017. 142pp.

Ian HAMILL, Kevin PARKHILL, Stephen STEERE and Roy GAULT, The Perfin Society Illustrated Handbook of GB Perfins - Hospital Dies. The Perfin Society, 1993. 28pp.

John S. NELSON, The Handbook of British Perfins. 1st edition Westerham: John S. Nelson, 1967. 30pp.

--- The Handbook of British Perfins. 3rd edition Northwood, Middlesex: Perfin Society, 1988. 30pp.

--- Catalogue of Perfins 1924-1925 British Empire Exhibition Stamps. The Perfin Society, 1993. 16pp.

Mary E. THORNTON, Catalogue of Official Perfins. Section 1, Great Britain. London: The Great Britain Philatelic Society, 1967. 16pp.

A History of J. Sloper & Co.'s Stamp Security Service. London: J. Sloper & Company 16pp.