"A Memory of the Mumps."
MLA
Hansen, Bert, 1944-. "A Memory of the Mumps.". Box 3, folder 7. 1860 August 11. https://collections.library.yale.edu/catalog/32329448.
APA, 6th edition
Hansen, Bert, 1944-. (["Box 3, folder 7"])(1860 August 11)["A Memory of the Mumps."]. https://collections.library.yale.edu/catalog/32329448.