MLA

Luhan, Mabel Dodge, 1879-1962. Saben, Mowry. Box 31, folder 881. 1914-15, n.d.. https://collections.library.yale.edu/catalog/32196793.

APA, 6th edition

Luhan, Mabel Dodge, 1879-1962. (["Box 31, folder 881"])(1914-15, n.d.)[Saben, Mowry]. https://collections.library.yale.edu/catalog/32196793.