Catalogues Raisonnés

• MacDonald, Margaret F., James McNeill Whistler. Drawings, Pastels and Watercolours. A Catalogue Raisonné, New Haven and London, 1995 (cat. no. 1287) as 'The Purple Cap'.

Catalogues 1855-1905

• Oil Paintings, Water Colors, Pastels and Drawings: Memorial Exhibition of the Works of Mr. J. McNeill Whistler, Copley Society, Boston, 1904 (cat. no. 121) as 'The Purple Cap'.
• Œuvres de James McNeill Whistler, Palais de l'Ecole des Beaux-Arts, Paris, 1905 (cat. no. 146).

Catalogues 1906-Present

• Curry, David Park, James McNeill Whistler at the Freer Gallery of Art, New York and London, 1984, pp. 48, 274, pl. 275.

Websites

• Freer Gallery of Art website at https://asia.si.edu/object/F1902.111a-c as 'The Purple Cap'.