Notebook 20
MLA
Barrie, J. M. (James Matthew), 1860-1937. Notebook 20. Box 24, folder 742. 1902?. https://collections.library.yale.edu/catalog/2008327.
APA, 6th edition
Barrie, J. M. (James Matthew), 1860-1937. (["Box 24, folder 742"])(1902?)[Notebook 20]. https://collections.library.yale.edu/catalog/2008327.