Susan Benjamin, English Enamel Boxes from the Eighteenth to the Twentieth Centuries (London: Orbis Publishing, 1978)
Tom Cope, Bilston Enamels of the 18th Century (published by the Black Country Society, no date)
John Culme, British Silver Boxes 1640-1840. The Lion Collection (Antique Collectors’ Club 2015)
Hanneke Grootenboer, ‘Treasuring the Gaze: Eye Miniature Portraits and the Intimacy of Vision’, The Art Bulletin 88.3 (2006), pp. 496–507
Thomas Hainschwang and Laurence Leggio, ‘The Characterization Of Tortoise Shell and Its Imitations’, Gems and Gemology 42.1 (2006), pp. 36–52.
Karen Hearn, ‘Revising the Visage: Patches and Beauty Spots in Seventeenth-Century British and Dutch Painted Portraits’, Huntington Library Quarterly 78.4 (2015), pp. 809–23
Erma Hermens, ‘Tortoise Shell: The Real Thing and its Imitations’, Looking Through Art, 10 June 2020
Allison C. Meier, ‘18th-Century Lovers Exchanged Portraits of Their Eyes’, JSTOR Daily, 23 March 2020
Aileen Ribeiro, Facing Beauty: Painted Women and Cosmetic Art (New Haven and London, Yale University Press, 2011)
Joachim F. Richter, Antique Enamels for Collectors (Schiffer Publishing, 1990)