MLA

Douglas, Norman, 1868-1952. The Obelisk Press. Box 45. 1939-1940. https://collections.library.yale.edu/catalog/16454749.

APA, 6th edition

Douglas, Norman, 1868-1952. (["Box 45"])(1939-1940)[The Obelisk Press]. https://collections.library.yale.edu/catalog/16454749.