"The Cultivation of Drug Clerks."
MLA
Hansen, Bert, 1944-. "The Cultivation of Drug Clerks.". Box 2, folder 13. 1873 September 6. https://collections.library.yale.edu/catalog/32332463.
APA, 6th edition
Hansen, Bert, 1944-. (["Box 2, folder 13"])(1873 September 6)["The Cultivation of Drug Clerks."]. https://collections.library.yale.edu/catalog/32332463.