MLA

Dellenbaugh, Frederick Samuel, 1853-1935. The Powell Memorial Monument Grand Canyon, Arizona, erected by Congress .... Box 1 | Folder 29. 1934. https://collections.library.yale.edu/catalog/2017652.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1 | Folder 29"])(1934)[The Powell Memorial Monument Grand Canyon, Arizona, erected by Congress ...]. https://collections.library.yale.edu/catalog/2017652.