MLA

Hansen, Bert, 1944-. "The Advertising Craze. It is enough to make a nervous man think he has them all.". Box 6, folder 12. 1893 December 23. https://collections.library.yale.edu/catalog/32326654.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 6, folder 12"])(1893 December 23)["The Advertising Craze. It is enough to make a nervous man think he has them all."]. https://collections.library.yale.edu/catalog/32326654.