MLA

Hansen, Bert, 1944-. "Something Doing At Washington. Dr. Wilson 'Prepare yourself for a great joy. I think it's going to be twins'.". Box 12, folder 16. 1913 July 16. https://collections.library.yale.edu/catalog/32326622.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 12, folder 16"])(1913 July 16)["Something Doing At Washington. Dr. Wilson 'Prepare yourself for a great joy. I think it's going to be twins'."]. https://collections.library.yale.edu/catalog/32326622.