MLA

Clark, Eleanor, 1913-1996. "Remembering Yaddo," essay. Box 22, folder 251. 1986. https://collections.library.yale.edu/catalog/17123993.

APA, 6th edition

Clark, Eleanor, 1913-1996. (["Box 22, folder 251"])(1986)["Remembering Yaddo," essay]. https://collections.library.yale.edu/catalog/17123993.