MLA

Ford, Charles Henri, 1908-2002. Tanguy, Yves. Box 4, folder 286. n.d.. https://collections.library.yale.edu/catalog/9998645.

APA, 6th edition

Ford, Charles Henri, 1908-2002. (["Box 4, folder 286"])(n.d.)[Tanguy, Yves]. https://collections.library.yale.edu/catalog/9998645.