MLA

Barrie, J. M. (James Matthew), 1860-1937. Notebook 1. Box 21, folder 719-720. 1880–1885. https://collections.library.yale.edu/catalog/10086145.

APA, 6th edition

Barrie, J. M. (James Matthew), 1860-1937. (["Box 21, folder 719-720"])(1880–1885)[Notebook 1]. https://collections.library.yale.edu/catalog/10086145.