MLA

Stettheimer, Florine, 1871-1944. Diary. Box 6, folder 118-20. 1938-39. https://collections.library.yale.edu/catalog/17054796.

APA, 6th edition

Stettheimer, Florine, 1871-1944. (["Box 6, folder 118-20"])(1938-39)[Diary]. https://collections.library.yale.edu/catalog/17054796.