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