MLA

Luhan, Mabel Dodge, 1879-1962. Evans, Claire Spencer. Box 68, folder 1859. [ca. 1930s]. https://collections.library.yale.edu/catalog/32197082.

APA, 6th edition

Luhan, Mabel Dodge, 1879-1962. (["Box 68, folder 1859"])([ca. 1930s])[Evans, Claire Spencer]. https://collections.library.yale.edu/catalog/32197082.