MLA

Gascoyne, David, 1916-2001. _____, Claude. Box 11, folder 258. [circa 1950s]. https://collections.library.yale.edu/catalog/2055521.

APA, 6th edition

Gascoyne, David, 1916-2001. (["Box 11, folder 258"])([circa 1950s])[_____, Claude]. https://collections.library.yale.edu/catalog/2055521.