MLA

Williams, William Carlos, 1883-1963. William George Williams, ambrotype. Box 71, folder 1485a. circa 1853. https://collections.library.yale.edu/catalog/2052898.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 71, folder 1485a"])(circa 1853)[William George Williams, ambrotype]. https://collections.library.yale.edu/catalog/2052898.