MLA

Crane, Hart, 1899-1932. Schneider, Isidor. Box 5, folder 217. 1935 May 16. https://collections.library.yale.edu/catalog/17155295.

APA, 6th edition

Crane, Hart, 1899-1932. (["Box 5, folder 217"])(1935 May 16)[Schneider, Isidor]. https://collections.library.yale.edu/catalog/17155295.