MLA

Hansen, Bert, 1944-. "The Night Superintendent of Bellevue Hospital Enjoying Himself After a Late Dinner.". Box 3, folder 6. 1860 May 12. https://collections.library.yale.edu/catalog/32329446.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 3, folder 6"])(1860 May 12)["The Night Superintendent of Bellevue Hospital Enjoying Himself After a Late Dinner."]. https://collections.library.yale.edu/catalog/32329446.