MLA

Amichai, Yehuda, 1924-2000. Spoleto Festival, Spoleto, Italy. Box 50, folder 1601. [1966?]. https://collections.library.yale.edu/catalog/16637402.

APA, 6th edition

Amichai, Yehuda, 1924-2000. (["Box 50, folder 1601"])([1966?])[Spoleto Festival, Spoleto, Italy]. https://collections.library.yale.edu/catalog/16637402.