MLA

Simpson, Randolph Linsly, 1927-1992. B. P[eter] Paige, Plumbe Gallery, Washington, D.C. Full length portrait of Mrs. Washington; elderly lady wearing apron and cap, standing with cane, next to elaborate side chair. Carte de visite. Box 11, folder 327. circa 1859. https://collections.library.yale.edu/catalog/2003843.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 327"])(circa 1859)[B. P[eter] Paige, Plumbe Gallery, Washington, D.C. Full length portrait of Mrs. Washington; elderly lady wearing apron and cap, standing with cane, next to elaborate side chair. Carte de visite]. https://collections.library.yale.edu/catalog/2003843.