MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Mexico. Box 4, folder 147. 1929. https://collections.library.yale.edu/catalog/2025332.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 4, folder 147"])(1929)[Mexico]. https://collections.library.yale.edu/catalog/2025332.