MLA

Richardson, Dorothy M. (Dorothy Miller), 1873-1957. WELCOME: typescript 4 p.. Box 8, folder 187. n.d.. https://collections.library.yale.edu/catalog/16495651.

APA, 6th edition

Richardson, Dorothy M. (Dorothy Miller), 1873-1957. (["Box 8, folder 187"])(n.d.)[WELCOME: typescript 4 p.]. https://collections.library.yale.edu/catalog/16495651.