found: Leitch, R.P. A course of water-colour painting, 189-?:t.p. (London, Paris & New York: Cassell & Company, Limited)
found: The house of Cassell, 1848-1958, 1958:p. 87 (used style Cassell, Petter, Galpin & Company from 1878 to 1883; Cassell & Company Limited incorporated, 1883)
found: British literary publishing houses, 1820-1880 (Dict. of literary biog., v. 106) (via WWW, Feb. 27, 2007)(Cassell, Petter, Galpin and Company, London, 1878-1883; Cassell and Company Limited, London, 1883-1969; Cassell and Collier Macmillan, 1969-1978)