MLA

Clapp, Frederick Mortimer, 1879-1969. Diaries. Box 127. 1895. https://collections.library.yale.edu/catalog/17207997.

APA, 6th edition

Clapp, Frederick Mortimer, 1879-1969. (["Box 127"])(1895)[Diaries]. https://collections.library.yale.edu/catalog/17207997.