MLA

Ruggles, Carl, 1876-1971. Sketches. Box 26, folder 121. 1924. https://collections.library.yale.edu/catalog/32218048.

APA, 6th edition

Ruggles, Carl, 1876-1971. (["Box 26, folder 121"])(1924)[Sketches]. https://collections.library.yale.edu/catalog/32218048.