MLA

Jordan, Viola Baxter, 1887-1973. Bryher. Box 1, folder 3-5. 1941-42. https://collections.library.yale.edu/catalog/2036297.

APA, 6th edition

Jordan, Viola Baxter, 1887-1973. (["Box 1, folder 3-5"])(1941-42)[Bryher]. https://collections.library.yale.edu/catalog/2036297.