Citations: Gilbert, P. 2000: Butterfly Collectors and Painters. Four centuries of colour plates from The Library Collections of The Natural History Museum, London. Singapore, Beaumont Publishing Pte Ltd, X+166 S. S., B15: B 2547, pp. 32: Portr.
Harvey, J. M. V.; Gilbert, P.; Martin, K. 1996: A catalogue of manuscripts in the entomology library of the Natural History Museum, London. Mansell, London, xvi, 251 S., A 3755, pp. 80 (Sammlungsverbleib)
Hesselbart, G.; Oorschot, H. van; Wagener, S. 1995: Die Tagfalter der Türkei unter Berücksichtigung der angrenzenden Länder. 1-3 Bocholt, Selbstverlag S. Wagener, 1-754; 758-1354; 1-847 S., B15: B 2189:., pp. 1179-1199
Salmon, M. A. 2000: The Aurelian Legacy. British Butterflies and their Collectors. Martins, Great Horkesley : Harley Books, 1-432 S., B15: B 2518, pp. 199-201, Portr.
Seehausen, M.; Turiault, M.; Fliedner, H.; Deliry, C. 2023: "A nice old greybeard" - Friedrich Ris' correspondence archived at the Senckenberg Museum Franfurt/Main, Germany. Report/ International Dragonfly Fund. A Journal of the International Dragonfly Fund., Frankfurt 2023 (180), S. 1-84, 12 326, pp. 31