MLA

Cahun, Claude, 1894-1954. Correspondence and other papers. Box 1 | Folder 12. 1943-45, undated. https://collections.library.yale.edu/catalog/15730232.

APA, 6th edition

Cahun, Claude, 1894-1954. (["Box 1 | Folder 12"])(1943-45, undated)[Correspondence and other papers]. https://collections.library.yale.edu/catalog/15730232.