MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Grand Canyon. Box 3, folder 88. 1929. https://collections.library.yale.edu/catalog/2018230.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 3, folder 88"])(1929)[Grand Canyon]. https://collections.library.yale.edu/catalog/2018230.