MLA

Douglas, Norman, 1868-1952. "E" General. Box 45. 1942-1947. https://collections.library.yale.edu/catalog/16454727.

APA, 6th edition

Douglas, Norman, 1868-1952. (["Box 45"])(1942-1947)["E" General]. https://collections.library.yale.edu/catalog/16454727.