MLA

Brooks, Cleanth, 1906-1994. Jordan. Box 90, folder 1937. 1984. https://collections.library.yale.edu/catalog/33262597.

APA, 6th edition

Brooks, Cleanth, 1906-1994. (["Box 90, folder 1937"])(1984)[Jordan]. https://collections.library.yale.edu/catalog/33262597.