Catalogues Raisonnés
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MacDonald, Margaret F., James McNeill Whistler. Drawings, Pastels and Watercolours. A Catalogue Raisonné, New Haven and London, 1995 (cat. no. 1553) as 'Frog'.
Authored by Whistler
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Whistler, James McNeill, Eden versus Whistler: The Baronet and the Butterfly. A Valentine with a Verdict, Paris: Louis-Henry May, 1899, p. v.
Books on Whistler
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Pennell, Elizabeth Robins, and Joseph Pennell, The Whistler Journal, Philadelphia, 1921, p. 19.
Websites
- Library of Congress website at http://www.loc.gov.
Last updated: 19th March 2021 by Margaret