MLA

O'Neill, Eugene, 1888-1953. Sitting, with Carlotta Monterey Monterey O'Neill / Standing with Carlotta Monterey O'Neill. Box 108, folder 1823. circa 1920s. https://collections.library.yale.edu/catalog/2013206.

APA, 6th edition

O'Neill, Eugene, 1888-1953. (["Box 108, folder 1823"])(circa 1920s)[Sitting, with Carlotta Monterey Monterey O'Neill / Standing with Carlotta Monterey O'Neill]. https://collections.library.yale.edu/catalog/2013206.