MLA

Hansen, Bert, 1944-. "Für die ehrenwerthen Schulräthe.". Box 1, folder 11. 1879 January 8. https://collections.library.yale.edu/catalog/32325645.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 1, folder 11"])(1879 January 8)["Für die ehrenwerthen Schulräthe."]. https://collections.library.yale.edu/catalog/32325645.