MLA

Serge, Victor, 1890-1947. "France-Espagne," typescript carbon. Box 4, folder 181. 1944 Oct 10. https://collections.library.yale.edu/catalog/16495452.

APA, 6th edition

Serge, Victor, 1890-1947. (["Box 4, folder 181"])(1944 Oct 10)["France-Espagne," typescript carbon]. https://collections.library.yale.edu/catalog/16495452.