Sketch
MLA
Ruggles, Carl, 1876-1971. Sketch. Box 28, folder 119. undated. https://collections.library.yale.edu/catalog/32218062.
APA, 6th edition
Ruggles, Carl, 1876-1971. (["Box 28, folder 119"])(undated)[Sketch]. https://collections.library.yale.edu/catalog/32218062.