MLA

Barrie, J. M. (James Matthew), 1860-1937. Lucas, Audrey. Box 11, folder 323. 1921–1933. https://collections.library.yale.edu/catalog/17462843.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 11, folder 323"])(1921–1933)[Lucas, Audrey]. https://collections.library.yale.edu/catalog/17462843.