MLA

Howe, Susan, 1937-. Bertholf, Robert. Box 1. 2004-2005. https://collections.library.yale.edu/catalog/17165222.

APA, 6th edition

Howe, Susan, 1937-. (["Box 1"])(2004-2005)[Bertholf, Robert]. https://collections.library.yale.edu/catalog/17165222.