MLA

Hansen, Bert, 1944-. "Germ Proof. 'None of those microbes will get me while I can buy this vaccine!'". Box 11, folder 30. 1909 December 8. https://collections.library.yale.edu/catalog/32326854.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 11, folder 30"])(1909 December 8)["Germ Proof. 'None of those microbes will get me while I can buy this vaccine!'"]. https://collections.library.yale.edu/catalog/32326854.