MLA

Gascoyne, David, 1916-2001. Notebook. Box 3, folder 34. [circa 1978-80]. https://collections.library.yale.edu/catalog/2055311.

APA, 6th edition

Gascoyne, David, 1916-2001. (["Box 3, folder 34"])([circa 1978-80])[Notebook]. https://collections.library.yale.edu/catalog/2055311.