MLA

Gascoyne, David, 1916-2001. Bielesz, Peter. Box 10, folder 164. 1975. https://collections.library.yale.edu/catalog/2055497.

APA, 6th edition

Gascoyne, David, 1916-2001. (["Box 10, folder 164"])(1975)[Bielesz, Peter]. https://collections.library.yale.edu/catalog/2055497.