MLA

Murphy, Gerald, 1888-1964. Murphy, Gerald, multiple exposure portrait, made into postcard by J. Weiss, Basel, Switzerland. Box 21, folder 335. 1930. https://collections.library.yale.edu/catalog/10602807.

APA, 6th edition

Murphy, Gerald, 1888-1964. (["Box 21, folder 335"])(1930)[Murphy, Gerald, multiple exposure portrait, made into postcard by J. Weiss, Basel, Switzerland]. https://collections.library.yale.edu/catalog/10602807.