MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Canada. Box 4, folder 132. 1921. https://collections.library.yale.edu/catalog/2025204.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 4, folder 132"])(1921)[Canada]. https://collections.library.yale.edu/catalog/2025204.