Leaning on elbow (dark background)
MLA
O'Neill, Eugene, 1888-1953. Leaning on elbow (dark background). Box 110, folder 1911. [1936 Nov]. https://collections.library.yale.edu/catalog/15239685.
APA, 6th edition
O'Neill, Eugene, 1888-1953. (["Box 110, folder 1911"])([1936 Nov])[Leaning on elbow (dark background)]. https://collections.library.yale.edu/catalog/15239685.