MLA

Nathan, Robert, 1894-1985. Carbon typescript. Box 34. 1912-1963, undated. https://collections.library.yale.edu/catalog/17122985.

APA, 6th edition

Nathan, Robert, 1894-1985. (["Box 34"])(1912-1963, undated)[Carbon typescript]. https://collections.library.yale.edu/catalog/17122985.