MLA

Hansen, Bert, 1944-. "Our Perennial Pauper.". Box 11, folder 8. 1881 December 14. https://collections.library.yale.edu/catalog/32331778.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 11, folder 8"])(1881 December 14)["Our Perennial Pauper."]. https://collections.library.yale.edu/catalog/32331778.