MLA

Holden, Reuben A. (Reuben Andrus), 1918-. Timothy Cutler. Box 1, folder 2. circa 1967-1968. https://collections.library.yale.edu/catalog/10011702.

APA, 6th edition

Holden, Reuben A. (Reuben Andrus), 1918-. (["Box 1, folder 2"])(circa 1967-1968)[Timothy Cutler]. https://collections.library.yale.edu/catalog/10011702.