MLA

Luhan, Mabel Dodge, 1879-1962. Reed, John. Box 73, folder 2022. [1917?], n.d.. https://collections.library.yale.edu/catalog/2033305.

APA, 6th edition

Luhan, Mabel Dodge, 1879-1962. (["Box 73, folder 2022"])([1917?], n.d.)[Reed, John]. https://collections.library.yale.edu/catalog/2033305.