MLA

Ruggles, Carl, 1876-1971. Sketch. Box 26, folder 115. June 1921.. https://collections.library.yale.edu/catalog/32218042.

APA, 6th edition

Ruggles, Carl, 1876-1971. (["Box 26, folder 115"])(June 1921.)[Sketch]. https://collections.library.yale.edu/catalog/32218042.