MLA

Murphy, Gerald, 1888-1964. Copies of photographs of Villa America. Box 40, folder 756. undated. https://collections.library.yale.edu/catalog/10604606.

APA, 6th edition

Murphy, Gerald, 1888-1964. (["Box 40, folder 756"])(undated)[Copies of photographs of Villa America]. https://collections.library.yale.edu/catalog/10604606.