MLA

Gascoyne, David, 1916-2001. Untitled poem, typescript, corrected. Box 15, folder 344. [circa 1964]. https://collections.library.yale.edu/catalog/2055538.

APA, 6th edition

Gascoyne, David, 1916-2001. (["Box 15, folder 344"])([circa 1964])[Untitled poem, typescript, corrected]. https://collections.library.yale.edu/catalog/2055538.