MLA

Henri, Robert, 1865-1929. Shore, Henrietta M.. Box 9, folder 234. 1917-25. https://collections.library.yale.edu/catalog/17029577.

APA, 6th edition

Henri, Robert, 1865-1929. (["Box 9, folder 234"])(1917-25)[Shore, Henrietta M.]. https://collections.library.yale.edu/catalog/17029577.