MLA

Luhan, Mabel Dodge, 1879-1962. Van Vechten, Carl. Box 66, folder 1800-1803. 1933-34. https://collections.library.yale.edu/catalog/2002408.

APA, 6th edition

Luhan, Mabel Dodge, 1879-1962. (["Box 66, folder 1800-1803"])(1933-34)[Van Vechten, Carl]. https://collections.library.yale.edu/catalog/2002408.