Cite

"The Rival Doctor Kochs."

MLA

Hansen, Bert, 1944-. "The Rival Doctor Kochs.". Box 6, folder 9. 1890 December 13. https://collections.library.yale.edu/catalog/32331437.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 6, folder 9"])(1890 December 13)["The Rival Doctor Kochs."]. https://collections.library.yale.edu/catalog/32331437.