MLA

Amichai, Yehuda, 1924-2000. Wahlhaus family tree. Box 80, folder 2044. n.d.. https://collections.library.yale.edu/catalog/17283030.

APA, 6th edition

Amichai, Yehuda, 1924-2000. (["Box 80, folder 2044"])(n.d.)[Wahlhaus family tree]. https://collections.library.yale.edu/catalog/17283030.