MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Grand Canyon. Box 2, folder 67. 1916-34. https://collections.library.yale.edu/catalog/2017917.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 2, folder 67"])(1916-34)[Grand Canyon]. https://collections.library.yale.edu/catalog/2017917.