MLA

Holden, Reuben A. (Reuben Andrus), 1918-. A. Whitney Griwold. Box 1, folder 14. circa 1967-1968. https://collections.library.yale.edu/catalog/10011743.

APA, 6th edition

Holden, Reuben A. (Reuben Andrus), 1918-. (["Box 1, folder 14"])(circa 1967-1968)[A. Whitney Griwold]. https://collections.library.yale.edu/catalog/10011743.