Cf. Sylvie Raulet, "Van Cleef & Arpels", Editions du Regard, Paris, 1986, page 208
Cf. Palais Galliera, "Van Cleef & Arpels", Diffusion Paris Musées, Paris, 1992, page 161, illustration 320
Cf. A Kenneth Snowman, "The Master Jewelers", Harry N Abrams, New York, 1990, page 215