MLA

Murphy, Gerald, 1888-1964. Porter, Cole. Box 8, folder 136-137. 1942-1965, undated. https://collections.library.yale.edu/catalog/10716698.

APA, 6th edition

Murphy, Gerald, 1888-1964. (["Box 8, folder 136-137"])(1942-1965, undated)[Porter, Cole]. https://collections.library.yale.edu/catalog/10716698.