MLA

Draper, Muriel, 1886-1952. Pamphlets. Box 20, folder 641. 1943-44, n.d.. https://collections.library.yale.edu/catalog/17126705.

APA, 6th edition

Draper, Muriel, 1886-1952. (["Box 20, folder 641"])(1943-44, n.d.)[Pamphlets]. https://collections.library.yale.edu/catalog/17126705.