MLA

Draper, Muriel, 1886-1952. Douglas, Norman. Box 2, folder 67-68. 1918-38. https://collections.library.yale.edu/catalog/17126684.

APA, 6th edition

Draper, Muriel, 1886-1952. (["Box 2, folder 67-68"])(1918-38)[Douglas, Norman]. https://collections.library.yale.edu/catalog/17126684.