"R" general
MLA
Warren, Robert Penn, 1905-1989. "R" general. Box 58, folder 1138-47. 1934-87. https://collections.library.yale.edu/catalog/11492773.
APA, 6th edition
Warren, Robert Penn, 1905-1989. (["Box 58, folder 1138-47"])(1934-87)["R" general]. https://collections.library.yale.edu/catalog/11492773.