MLA

Butts, Mary, 1890-1937. "An Answer," typescript carbon. Box 5, folder 83. n.d.. https://collections.library.yale.edu/catalog/16586530.

APA, 6th edition

Butts, Mary, 1890-1937. (["Box 5, folder 83"])(n.d.)["An Answer," typescript carbon]. https://collections.library.yale.edu/catalog/16586530.