MLA

Wharton, Edith, 1862-1937. Scenario. Box 18, folder 562. n.d.. https://collections.library.yale.edu/catalog/32182507.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 18, folder 562"])(n.d.)[Scenario]. https://collections.library.yale.edu/catalog/32182507.