MLA

Barrie, J. M. (James Matthew), 1860-1937. Boucicault, Dion. Box 4, folder 67. 1905–1928. https://collections.library.yale.edu/catalog/32312184.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 4, folder 67"])(1905–1928)[Boucicault, Dion]. https://collections.library.yale.edu/catalog/32312184.