Cite

Unknown printer, "Hear our War Heroes", Flyer (in Series II)

MLA

Simpson, Randolph Linsly, 1927-1992. Unknown printer, "Hear our War Heroes", Flyer (in Series II). Box 50, folder 1245. undated. https://collections.library.yale.edu/catalog/16173230.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 50, folder 1245"])(undated)[Unknown printer, "Hear our War Heroes", Flyer (in Series II)]. https://collections.library.yale.edu/catalog/16173230.