MLA

Palmquist, Peter E. (1936-2003). Pitt, Ada. Box 287, folder 1525. 1971-2003. https://collections.library.yale.edu/catalog/12247104.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 287, folder 1525"])(1971-2003)[Pitt, Ada]. https://collections.library.yale.edu/catalog/12247104.