John Chaloner Smith, British mezzotinto portraits, part 3, London 1880, pp. 1298-1299 ("143. Benjamin, Count Rumford. Nearly W. L., sitting, directed, facing, and looking towards right, J. R. Smith. dark coat, light vest with sash across, right elbow on arm of chair hand supporting head, left arm on chair, inkstand and papers on table to left, in front of which at bottom is a portfolio, curtain in background, bookshelves to right. Under, Benjamin Count of Rumford Knight of the Illustrious Orders of the White Eagle, and Saint Stanislaus: Chamberlain, Privy Counsellor of State, and Lieutenant General in the service of His Most Serene Highness the Elector Bavaro-Palatine. Vice-President of the Royal Society of London; and one of the managers of the Royal Institu tion of Great Britain : L. L. D. Acad. Reg. Hibern. Berol. Elec. Boicae. Palat. Americ Genev. et Mancuniens. socius. &c. Painted, engraved, & published April 2, 1801, by I, R, Smith mezzotinto engraver to H. R. H. the Prince of Wales, No 31 King Street, Covent Garden, London. H. 20; Sub. 18 ; W. 14. I. Before any inscription. Brit : Mus. II. As described. III. Retouched, under subject, Painted and engraved by J. R. Smith. Published by E. Evans 1 Gt Queen St Lincolns Inn Fields, last line but one of inscription reworked, address erased, instead, Eminent for having applied natural philosophy to the uses & comforts of domestic life. Died August 21 , 1814. …")
R. Burgess, Portraits of doctors & scientists in the Wellcome Institute, London 1973, no. 2920.7
