MLA

Williams, William Carlos, 1883-1963. Various Williams family members and ancestors, unidentified. Box 71, folder 1488. 1900-1920s undated. https://collections.library.yale.edu/catalog/2009812.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 71, folder 1488"])(1900-1920s undated)[Various Williams family members and ancestors, unidentified]. https://collections.library.yale.edu/catalog/2009812.