MLA

Murphy, Gerald, 1888-1964. Durante, Jimmie with Lou Clayton and Ed Jackson, cartoon postcard for "Just for a Laugh at the Parody Restaurant". Box 26, folder 472. undated. https://collections.library.yale.edu/catalog/16515319.

APA, 6th edition

Murphy, Gerald, 1888-1964. (["Box 26, folder 472"])(undated)[Durante, Jimmie with Lou Clayton and Ed Jackson, cartoon postcard for "Just for a Laugh at the Parody Restaurant"]. https://collections.library.yale.edu/catalog/16515319.