MLA

Ozick, Cynthia (April 17, 1928). Ozick and Regelson family. Box 303. 1939-1958, undated. https://collections.library.yale.edu/catalog/33551397.

APA, 6th edition

Ozick, Cynthia (April 17, 1928). (["Box 303"])(1939-1958, undated)[Ozick and Regelson family]. https://collections.library.yale.edu/catalog/33551397.