comprising: George, John Nigel, English Pistols & Revolvers, London, 1961; Smith, Joseph E., Book of Pistols and Revolvers, seventh edition, Harrisburg, 1968; The Metropolitan Museum of Art, Early Firearms of Great Britain and Ireland from the Collection of Clay P. Bedford, 1971; and Grant, David & Venters, Vic, The Best of British: A Celebration of British Gunmaking, Shrewsbury, 2010 (4 volumes)