MLA

Jordan, Viola Baxter, 1887-1973. Shakespear, Hope. Box 3, folder 95. n.y. Apr 18. https://collections.library.yale.edu/catalog/2038144.

APA, 6th edition

Jordan, Viola Baxter, 1887-1973. (["Box 3, folder 95"])(n.y. Apr 18)[Shakespear, Hope]. https://collections.library.yale.edu/catalog/2038144.