Currently Leslie Smith Gallery has no works in the collection by this artist.

A. Stott, Hollandgekte. De onbekende Nederlandse periode in de Amerikaanse kunst en cultuur, Amsterdam 1998, p. 29;
H. Kraan, Dromen van Holland. Buitenlandse kunstenaars schilderen Holland, 1800-1914, Zwolle/Den Haag 2002, p. 225, 326-329, 345;
C. Denninger-Schreuder, Schilders van Laren, Bussum 2003, p. 92-94.

The following museums have work by Charles Paul Gruppé in the collection: National Gallery of Canada, Ottawa, Smithsonian American Art Museum, Washington DC, Cahoon Museum of American Art, Cotuit (Massachusetts), Oglethorpe University Museum, Georgia, Springville Museum of Art, Utah, University of Lethbridge Art Gallery, Alberta, Canada.