MLA

Murphy, Gerald, 1888-1964. Lindsay, Elizabeth. Box 5, folder 90. 1936-1949. https://collections.library.yale.edu/catalog/32308291.

APA, 6th edition

Murphy, Gerald, 1888-1964. (["Box 5, folder 90"])(1936-1949)[Lindsay, Elizabeth]. https://collections.library.yale.edu/catalog/32308291.