MLA

Rouse, Ruth, 1872-1956. Diary. Box 1, folder 1. 1900 July–1901 October. https://collections.library.yale.edu/catalog/33098826.

APA, 6th edition

Rouse, Ruth, 1872-1956. (["Box 1, folder 1"])(1900 July–1901 October)[Diary]. https://collections.library.yale.edu/catalog/33098826.