MLA

Winslow, C.-E. A. (Charles-Edward Amory), 1877-1957. Winslow, O.F. Ball, R.L. Wilbur (Committee on the Costs of Medical Care): print. Box 134, folder 89. 1932 November 29. https://collections.library.yale.edu/catalog/10016071.

APA, 6th edition

Winslow, C.-E. A. (Charles-Edward Amory), 1877-1957. (["Box 134, folder 89"])(1932 November 29)[Winslow, O.F. Ball, R.L. Wilbur (Committee on the Costs of Medical Care): print]. https://collections.library.yale.edu/catalog/10016071.