MLA

Serge, Victor, 1890-1947. "Jakson-Mornard continue la lutte...," typescript carbon. Box 4, folder 201. 1943 Oct 22. https://collections.library.yale.edu/catalog/16495456.

APA, 6th edition

Serge, Victor, 1890-1947. (["Box 4, folder 201"])(1943 Oct 22)["Jakson-Mornard continue la lutte...," typescript carbon]. https://collections.library.yale.edu/catalog/16495456.