MLA

Richardson, Dorothy M. (Dorothy Miller), 1873-1957. A STRANGER ABOUT: typescript (2 carbon copies) 8, 8 p.. Box 8, folder 174. n.d.. https://collections.library.yale.edu/catalog/16495641.

APA, 6th edition

Richardson, Dorothy M. (Dorothy Miller), 1873-1957. (["Box 8, folder 174"])(n.d.)[A STRANGER ABOUT: typescript (2 carbon copies) 8, 8 p.]. https://collections.library.yale.edu/catalog/16495641.