MLA

Gold, Michael, 1893-1967. "Change the World" [open letter to Richard Wright], printed version, Daily Worker. Box 89 | Folder 1098. 1940 Sep 29. https://collections.library.yale.edu/catalog/10466726.

APA, 6th edition

Gold, Michael, 1893-1967. (["Box 89 | Folder 1098"])(1940 Sep 29)["Change the World" [open letter to Richard Wright], printed version, Daily Worker]. https://collections.library.yale.edu/catalog/10466726.