MLA

Henri, Robert, 1865-1929. Paint 3 notebook. Box 26, folder 600-605. 1919-20. https://collections.library.yale.edu/catalog/17029596.

APA, 6th edition

Henri, Robert, 1865-1929. (["Box 26, folder 600-605"])(1919-20)[Paint 3 notebook]. https://collections.library.yale.edu/catalog/17029596.