Cite

"Berlin--Dr. Koch's Method Before The Surgical Society."

MLA

Hansen, Bert, 1944-. "Berlin--Dr. Koch's Method Before The Surgical Society.". Box 12, folder 30. 1890 December 27. https://collections.library.yale.edu/catalog/32334810.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 12, folder 30"])(1890 December 27)["Berlin--Dr. Koch's Method Before The Surgical Society."]. https://collections.library.yale.edu/catalog/32334810.