MLA

Serge, Victor, 1890-1947. Les années sans pardon. Box 21, folder 665. 1971-81, n.d.. https://collections.library.yale.edu/catalog/16495491.

APA, 6th edition

Serge, Victor, 1890-1947. (["Box 21, folder 665"])(1971-81, n.d.)[Les années sans pardon]. https://collections.library.yale.edu/catalog/16495491.