OATES, F. A. HARMAN, Catalogue of Finger Rings brought together by F. A. H. Oates, Privately printed, 1917; De Ricci, Seymour, Catalogue of a Collection of Ancient Rings formed by the late E. Guilhou, Paris, 1912; Henig, Martin and Whiting, Mary, Engraved Gems from Gadara in Jordan: The Sa'd Collection, Oxford, 1987; Collection Max Crèpy: Glytique et Intailles Hotel Drouot, Paris, December 1989; Berry, Burton Y., Ancient Gems from The Collection of Burton Y. Berry, Indiana, 1969; Ringe aus vier Jahrtausenden, Frankfurt am Main, 1963; Intailles et Camèes de la Collection du Prèsident de Robien, Musèes de Rennes, 1972; and two Christie's sale catalogues, Rings from Antiquity to the Present Day, London, October 1988 and 1989 (9)