MLA

Dunbar, Rudolph, 1899-1988. German war propaganda. Box 2, folder 43. 1942–1943. https://collections.library.yale.edu/catalog/17398753.

APA, 6th edition

Dunbar, Rudolph, 1899-1988. (["Box 2, folder 43"])(1942–1943)[German war propaganda]. https://collections.library.yale.edu/catalog/17398753.