MLA

O'Neill, Eugene, 1888-1953. Moffat, John. Box 38, folder 836-839. 1955-66, n.d.. https://collections.library.yale.edu/catalog/2035819.

APA, 6th edition

O'Neill, Eugene, 1888-1953. (["Box 38, folder 836-839"])(1955-66, n.d.)[Moffat, John]. https://collections.library.yale.edu/catalog/2035819.