MLA

Mason, John T., b. 1822. Daily Pocket Diary for the Year 1858. Box 1 | Folder 2. 1858. https://collections.library.yale.edu/catalog/16710347.

APA, 6th edition

Mason, John T., b. 1822. (["Box 1 | Folder 2"])(1858)[Daily Pocket Diary for the Year 1858]. https://collections.library.yale.edu/catalog/16710347.