Sketch
MLA
Ruggles, Carl, 1876-1971. Sketch. Box 23, folder 122. undated. https://collections.library.yale.edu/catalog/32208530.
APA, 6th edition
Ruggles, Carl, 1876-1971. (["Box 23, folder 122"])(undated)[Sketch]. https://collections.library.yale.edu/catalog/32208530.