MLA

Hartley, Marsden, 1877-1943. Sparhawk-Jones, Elizabeth. Box 12. 1936-1942. https://collections.library.yale.edu/catalog/16723433.

APA, 6th edition

Hartley, Marsden, 1877-1943. (["Box 12"])(1936-1942)[Sparhawk-Jones, Elizabeth]. https://collections.library.yale.edu/catalog/16723433.