MLA

Simpson, Randolph Linsly, 1927-1992. Excelsior Photo Art Gallery, J.T. Wampler, Charlottesville, VA Double portrait; young boy standing beside girl seated in chair; both well-dressed. Carte de visite. Box 11, folder 486. circa 1880. https://collections.library.yale.edu/catalog/2003957.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 486"])(circa 1880)[Excelsior Photo Art Gallery, J.T. Wampler, Charlottesville, VA Double portrait; young boy standing beside girl seated in chair; both well-dressed. Carte de visite]. https://collections.library.yale.edu/catalog/2003957.