Cite

"A Hygienic revolution."

MLA

Hansen, Bert, 1944-. "A Hygienic revolution.". Box 12, folder 1. 1910 September 21. https://collections.library.yale.edu/catalog/32325804.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 12, folder 1"])(1910 September 21)["A Hygienic revolution."]. https://collections.library.yale.edu/catalog/32325804.