MLA

Zilboorg, James, 1892-1968. "T" general. Box 3, folder 64. 1913, undated. https://collections.library.yale.edu/catalog/17096143.

APA, 6th edition

Zilboorg, James, 1892-1968. (["Box 3, folder 64"])(1913, undated)["T" general]. https://collections.library.yale.edu/catalog/17096143.