MLA

Barrie, J. M. (James Matthew), 1860-1937. Zukor, Adolph. Box 20, folder 718. 1920–1925. https://collections.library.yale.edu/catalog/2109670.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 20, folder 718"])(1920–1925)[Zukor, Adolph]. https://collections.library.yale.edu/catalog/2109670.