MLA

Hansen, Bert, 1944-. "Nursing Our Infant Industries.". Box 9, folder 4. 1883 June 27. https://collections.library.yale.edu/catalog/32326656.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 9, folder 4"])(1883 June 27)["Nursing Our Infant Industries."]. https://collections.library.yale.edu/catalog/32326656.