MLA

Barrie, J. M. (James Matthew), 1860-1937. Letters. Box 3, folder 33-38. 1933-1937. https://collections.library.yale.edu/catalog/32311291.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 3, folder 33-38"])(1933-1937)[Letters]. https://collections.library.yale.edu/catalog/32311291.