MLA

Ford, Charles Henri, 1908-2002. Jaguer, Edouard. Box 1, folder 88. 1946 Mar 26. https://collections.library.yale.edu/catalog/17124853.

APA, 6th edition

Ford, Charles Henri, 1908-2002. (["Box 1, folder 88"])(1946 Mar 26)[Jaguer, Edouard]. https://collections.library.yale.edu/catalog/17124853.