MLA

Hansen, Bert, 1944-. "Let Boss Platt Beware. Father Knickerbocker is in Training for This 'Sandow Act'.". Box 10, folder 27. 1897 June 9. https://collections.library.yale.edu/catalog/32331621.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 10, folder 27"])(1897 June 9)["Let Boss Platt Beware. Father Knickerbocker is in Training for This 'Sandow Act'."]. https://collections.library.yale.edu/catalog/32331621.