MLA

Richardson, Dorothy M. (Dorothy Miller), 1873-1957. LITERARY ESSAYS: autograph MS draft of an essay on her development as a writer 2 p.. Box 8, folder 159. n.d.. https://collections.library.yale.edu/catalog/17300477.

APA, 6th edition

Richardson, Dorothy M. (Dorothy Miller), 1873-1957. (["Box 8, folder 159"])(n.d.)[LITERARY ESSAYS: autograph MS draft of an essay on her development as a writer 2 p.]. https://collections.library.yale.edu/catalog/17300477.