MLA

Barrie, J. M. (James Matthew), 1860-1937. Typescript, Act III. Box 42, folder 921. 1905. https://collections.library.yale.edu/catalog/32314135.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 42, folder 921"])(1905)[Typescript, Act III]. https://collections.library.yale.edu/catalog/32314135.