MLA

Ozick, Cynthia (April 17, 1928). Packet [4]. circa 1900-2021. https://collections.library.yale.edu/catalog/33552112.

APA, 6th edition

Ozick, Cynthia (April 17, 1928). (circa 1900-2021)[Packet [4]]. https://collections.library.yale.edu/catalog/33552112.