John Chaloner Smith, British mezzotinto portraits, part I, London 1883, pp. 414-415, no. 300 ("W. L., standing, directed towards left, facing and looking to front, wig, gown over plain coat, hat in right hand, left in pocket of coat, steps and pillars in background to left. Under, in centre arms, T. Hudson pinxt. J. Faber fecit 1744 Hanc Henrici Prude Societatis Pharmaceuticae Londinensis imaginem Georgio Pile M.D. D.D.D, Johannis Faber. … II. Plate cut 1 5/8 at top, 4 3/8 at bottom, 2 3/8 at left, 2 at right side,1 ½ subject scraped away at bottom, on which, T. Hudson pinxt. I. Faber fecit 1750. A citizen of London in his livery gown.. … Apothecary in London")
R. Burgess, Portraits of doctors & scientists in the Wellcome Institute, London 1973, no. 2394.2