Reference: Percy Catalogue

John Percy, interleaved in 'Drawings in Water Colours by Artists Born Anterior to 1800 and Now Deceased Illustrative of the Progress and Development of That Branch of the Fine Arts in Great Britain', exhibition catalogue, Burlington Fine Arts Club, 1871, Manuscript Catalogue of British Watercolours and Drawings,, British Museum, London, Department of Prints and Drawings (NNN.5.21)