MLA

Serge, Victor, 1890-1947. Book inventory, typescript carbon. Box 17, folder 629. n.d.. https://collections.library.yale.edu/catalog/16495490.

APA, 6th edition

Serge, Victor, 1890-1947. (["Box 17, folder 629"])(n.d.)[Book inventory, typescript carbon]. https://collections.library.yale.edu/catalog/16495490.