MLA

Hartley, Marsden, 1877-1943. Nitrate Negatives. Box 37 . undated. https://collections.library.yale.edu/catalog/33410178.

APA, 6th edition

Hartley, Marsden, 1877-1943. (["Box 37 "])(undated)[Nitrate Negatives]. https://collections.library.yale.edu/catalog/33410178.