R.C. Alcock and  F.C. Holland, Hand-engraved Plates 50 and 51. Alphabet IV, R.C.  Alcock Ltd., Cheltenham, 1948

R.C. Alcock, Reserve Plate 16. One Penny Rose-Red on White Paper. Alphabet II, R.C. Alcock Ltd., Cheltenham, 1947

Roland Brown and Harold W. Fisher, The Plating of the Penny 1840-64, Vol.  I  Plates 1-45;  Vol. II   Plates 46-91; Vol. III Plates 92-131;  Vol. IV Plates 132-175;  Vol. V Plates 176-204. The Great Britain  Philatelic Society, London

Edward D. Bacon, The Line-Engraved Postage Stamps of Great Britain Printed by Perkins, Bacon & Co., Chas. Nissen & Co., Ltd., London, 1920

Edward D. Bacon,  Suppliment to The Line-Engraved Postage Stamps of Great Britain Printed by Perkins, Bacon & Co., Chas. Nissen & Co., Ltd., London, 1929

Edward D. Bacon, The Essays, Proofs, Colour Trials and Reprints of the Line-Engraved Postage Stamps of Great Britain Printed by Perkins, Bacon & Co., Ltd., London, Chas. Nissen & Co., Ltd., London, 1936

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

H.W. Eddison, Penny Red-Brown Die II - Alphabet III. On Blued Paper. Plates 22-26,  28-30,  32, 40, R.C. Alcock Ltd., Cheltenham

Clive Gardner-Hill, The Stamps of Great Britain. The Line-Engraved Issues. Archer Plates, 1841 Penny Red, R.C. Alcock Ltd., Cheltenham, 1950

Clive Gardner-Hill, The Stamps of Great Britain. The Line-Engraved Issues. 1841 Penny Red. Die I. Plates 102-131. Constant Varieties, 2nd edn., R.C. Alcock Ltd., Cheltenham, 1950

Clive Gardner-Hill, The Stamps of Great Britain. The Line-Engraved Issues. 1841 Penny Red. Die I. Alphabet I. Plates 92-101,  2nd edn.., Banbury, 1950

Clive Gardner-Hill, The Stamps of Great Britain. The Line-Engraved Issues. 1841 Penny Red. Die I. Plates 102-131, R.C. Alcock Ltd., Cheltenham, 1951

F.C. Holland, Reserve Plate 17. Die II. Alphabet III, R.C. Alcock Ltd., Cheltenham, 1949

P.C. Litchfield, Guide Lines to the Penny Black, Robson Lowe Ltd., London 1949. Reprinted 1979

C.F. Dendy Marshall, A Study of the Line-Engraved Twopence Postage Stamps of Great Britain, Harris Publications Ltd., London, 1929

Fred J. Melville, The Stamps of Great Britain: Line-Engraved Stamps, The British Philatelist, Chas. Nissen & Co., Ltd., London, 1926

Charles Nissen and Bertram McGowen, The Plating of the Penny Black Stamps of Great Britain, 1840, Chas. Nissen & Co., London, 1922

H. Osborne, British Line-Engraved  Stamps - Repaired Impressions, H. F. Johnson, London, 1950

H. Osborne, British Line-Engraved Stamps. Twopence Blue. Studies of Plates 1 to 15, H.F. Johnson, London, 1948

H. Osborne, Twopence - Plate 9. A Study of the Plate and its Repairs, Chas. Nissen & Co., Ltd., London, 1939

H. Osborne, The Ray-Flaws of the Plates 1 and 2 of the Penny Black Postage Stamps of great Britain, Chas. Nissen & Co., London, 1932

A.G. Rigo de Righi, The Story of the Penny Black and its Contemporaries, National Postal Museum, 1980

J.B. Seymour,The Postage Stamps of Great Britain. Part I. The Line-Engraved Issues, 1840-1853, 3rd edn. edited by John Easton, The Royal Philatelic Society, London, 1967

J.B. Seymour, The Postage Stamps of Great Britain, Part II. With Addenda and Corrigenda to Part I. The Remainder of the Line-Engraved Issues and Embossed Adhesives and Surface Printed Issues up to 1865, 1st edn., The Royal Philatelic Society, London, 1937

J.B.M. Stanton, The Varieties and Characteristics of the 1d. Red Line-Engraved Stamps, 1841-1864, Chas. Nissen & Co. Ltd., London, 1958

J.W.W. Stone, The Repairs of the 1841 One Penny Plates 1-40, R.C. Alcock Ltd., Cheltenham, 1974

W.R.D. Wiggens, The Postage Stamps of Great Britain, Part. II. The Perforated Line-Engraved Issues, 2nd edn., The Royal Philatelic Society, London, 1962

W.R.D. Wiggens,The Plating of Alphabet II, Plates 1 to 24,  Robson Lowe Ltd., London, 1974

W.R.D. Wiggens and G.C. Tonna,The Plating of Alphabet III Plates 22 to 68 and R17, together with Alphabet IV (Plates 50 and 51) and Alphabet II  (R15 and R16). 5 Vols., R.A. Potter, 12 Middle Row, Maidstone, Kent, 1973-74

Percy De Worms, Perkins, Bacon Records, 2 vols., The Royal Philatelic Society, London, 1953

Hastings E. Wright and  A.B. Creeke Jr., The History of the Adhesive Stamps of the British Isles available for Postal and Telegraph Purposes, Philatelic Society, London, 1899 (Suppliment published in 1903)