MLA

Barrie, J. M. (James Matthew), 1860-1937. Diary. Box 56, folder 1150. 1880. https://collections.library.yale.edu/catalog/2008329.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 56, folder 1150"])(1880)[Diary]. https://collections.library.yale.edu/catalog/2008329.