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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Macm. de Béthune, Duke of Sully. Painted by Dubois" The New York Public Library Digital Collections. 1823-03-. https://digitalcollections.nypl.org/items/869c37c0-5109-0130-97b2-58d385a7b928
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Macm. de Béthune, Duke of Sully. Painted by Dubois" New York Public Library Digital Collections. Accessed January 30, 2025. https://digitalcollections.nypl.org/items/869c37c0-5109-0130-97b2-58d385a7b928
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1823-03-). Macm. de Béthune, Duke of Sully. Painted by Dubois Retrieved from https://digitalcollections.nypl.org/items/869c37c0-5109-0130-97b2-58d385a7b928
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/869c37c0-5109-0130-97b2-58d385a7b928 | title=
(still image)
Macm. de Béthune, Duke of Sully. Painted by Dubois, (1823-03-)
|author=Digital Collections, The New York Public Library |accessdate=January 30, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>