MLA

Jordan, Viola Baxter, 1887-1973. Jordan, Viola. Box 1, folder 45. Jul 19, n.y.. https://collections.library.yale.edu/catalog/2037328.

APA, 6th edition

Jordan, Viola Baxter, 1887-1973. (["Box 1, folder 45"])(Jul 19, n.y.)[Jordan, Viola]. https://collections.library.yale.edu/catalog/2037328.