MLA

Cummins, Henry, 1840-. Diary. Folder 2. 1858 October 17-1859 October 16. https://collections.library.yale.edu/catalog/2067764.

APA, 6th edition

Cummins, Henry, 1840-. (["Folder 2"])(1858 October 17-1859 October 16)[Diary]. https://collections.library.yale.edu/catalog/2067764.