MLA

Amichai, Yehuda, 1924-2000. Popa, Vasko. Box 49, folder 1562. 1970. https://collections.library.yale.edu/catalog/2005962.

APA, 6th edition

Amichai, Yehuda, 1924-2000. (["Box 49, folder 1562"])(1970)[Popa, Vasko]. https://collections.library.yale.edu/catalog/2005962.