KECK, Sheldon - "The Connoisseur - "The New York conservation of a peripatetic portrait by John Singleton Copley", vol 159, (1965), pgs 138-143.

PARKER, Barbara Neville and WHEELER, Anne Bolling - John Singleton Copley: American Portraits in oil, pastel and miniature wth biographical sketches, 1938, Museum of Fine Arts, Boston.

PROWN, Jules David - "John Singleton Copley", (exhibition catalogue) 1965, National Gallery of Art.

REBORA, Carrie, STAITI Paul, HIRSCHLER Erica, STEBBINS JNR Theodore, TROYEN Carol -"John Singleton Copley in America", 1995, Metropolitan Museum of Art, New York.

http://www.worcesterart.org/Collection/Early_American/- The Worchester Art Museum

http://www.nga.gov/collection/collect.htm - The Smithsonian's National Gallery of Art, Washington DC.

http://www.nga.gov/feature/watson/watsonhome.html - National Gallery of Arts web feature looking at Copley's "Watson and the Shark".

http://www.nga.gov - The Smithsonian's National Portrait Gallery. Washington DC.

http://metmuseum.org/explore/copley/copley.html - The Metropolitan Museum of Art, New York

http://www.mfa.org/ - Boston Museum of Fine Arts

Selina Bartlett, Rights and Reproductions Assistant, Worcester Art Museum, Worcester, Massachusetts.

Shaula Coyl, Rights and Reproductions Assistant, Los Angeles County Museum of Art.

Susan Newton, Winterthur Museum, Winterthur, Delaware.

Paul Staiti, Professor of Fine Arts, Mount Holyoke College, Massachusetts.

Yvette C. Stickell, Manager, Office of Rights and Reproductions, National Portrait Gallery, Washington DC.

Jules Prown, Paul Mellon Professor Emeritus of the History of Art at Yale University, Connecticut.