Books by Carol Troyen:
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Troyen, Carol: John Singleton Copley in America (New York: Metropolitan Museum of Art, c1995), also by Carrie Rebora Barratt, Paul J. Staiti, Erica E. Hirshler, and Theodore E. Stebbins, contrib. by Morrison H. Heckscher, Aileen Ribeiro, and Marjorie Shelley (page images and PDF at Metropolitan Museum of Art and Google)
Find more by Carol Troyen at your library, or elsewhere.