"Pasteur's Method Practically Tried for the First Time in New York."
MLA
Hansen, Bert, 1944-. "Pasteur's Method Practically Tried for the First Time in New York.". Box 1, folder 20. 1886 July 6. https://collections.library.yale.edu/catalog/32332454.
APA, 6th edition
Hansen, Bert, 1944-. (["Box 1, folder 20"])(1886 July 6)["Pasteur's Method Practically Tried for the First Time in New York."]. https://collections.library.yale.edu/catalog/32332454.