MLA

Hansen, Bert, 1944-. "Tube Culture B. Tuberculosis--Culture on Agar Agar. Tubercle Bacilli in Sputum x 1000 Diameters.". Box 12, folder 23. 1897 March 6. https://collections.library.yale.edu/catalog/32335017.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 12, folder 23"])(1897 March 6)["Tube Culture B. Tuberculosis--Culture on Agar Agar. Tubercle Bacilli in Sputum x 1000 Diameters."]. https://collections.library.yale.edu/catalog/32335017.