^Purcell, John E. (March 1906). "Mr. George E. Robertson: An Interview". The English Illustrated Magazine. Macmillan and Company: 537–550.
^Graves, Algernon (1906). The Royal Academy of Arts: A Complete Dictionary of Contributors and Their Work from Its Foundation in 1769 to 1904. H. Graves and Company, Limited. p. 329.
^Exhibition of the Royal Academy. Vol. 120–123. Royal Academy of Arts. 1888. pp. 28, 33, 76.
^Stewart, Brian; Cutten, Mervyn (1997). The Dictionary of Portrait Painters in Britain Up to 1920. Antique Collectors' Club. p. 394.
ISBN978-1-85149-173-5.