MLA

Luhan, Mabel Dodge, 1879-1962. ----, Hazel. Box 39, folder 1138. 1915-49. https://collections.library.yale.edu/catalog/17085370.

APA, 6th edition

Luhan, Mabel Dodge, 1879-1962. (["Box 39, folder 1138"])(1915-49)[----, Hazel]. https://collections.library.yale.edu/catalog/17085370.