MLA

Serge, Victor, 1890-1947. Romualdi, Serafino. "Contestacion à las calumnias de los communistas," typescript mimeograph. Box 14, folder 591. 1947 Jun 17. https://collections.library.yale.edu/catalog/17455301.

APA, 6th edition

Serge, Victor, 1890-1947. (["Box 14, folder 591"])(1947 Jun 17)[Romualdi, Serafino. "Contestacion à las calumnias de los communistas," typescript mimeograph]. https://collections.library.yale.edu/catalog/17455301.