MLA

Hartley, Marsden, 1877-1943. Crane, Hart. Box 11. 1932, undated. https://collections.library.yale.edu/catalog/16935223.

APA, 6th edition

Hartley, Marsden, 1877-1943. (["Box 11"])(1932, undated)[Crane, Hart]. https://collections.library.yale.edu/catalog/16935223.