MLA

Stepun, Fedor, 1884-1965. Certificate concerning FAS's displacement: typescript, signed, and typescript carbon copy. Box 68, folder 2080. 1937 Jun 14. https://collections.library.yale.edu/catalog/16495077.

APA, 6th edition

Stepun, Fedor, 1884-1965. (["Box 68, folder 2080"])(1937 Jun 14)[Certificate concerning FAS's displacement: typescript, signed, and typescript carbon copy]. https://collections.library.yale.edu/catalog/16495077.