MLA

Patterson, Catharine T. (Catharine Tinker). "Diana" fan. Box 13. undated. https://collections.library.yale.edu/catalog/15814305.

APA, 6th edition

Patterson, Catharine T. (Catharine Tinker). (["Box 13"])(undated)["Diana" fan]. https://collections.library.yale.edu/catalog/15814305.