MLA

Barrie, J. M. (James Matthew), 1860-1937. Adams, Maude. Box 1, folder 4. 1917–1920. https://collections.library.yale.edu/catalog/32309685.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 1, folder 4"])(1917–1920)[Adams, Maude]. https://collections.library.yale.edu/catalog/32309685.