MLA

Gombrowicz, Witold, 1904-1969. Bergman, Ingmar. Box 1, folder 28. 1964 Nov 2, n.d.. https://collections.library.yale.edu/catalog/2007761.

APA, 6th edition

Gombrowicz, Witold, 1904-1969. (["Box 1, folder 28"])(1964 Nov 2, n.d.)[Bergman, Ingmar]. https://collections.library.yale.edu/catalog/2007761.