MLA

Wharton, Edith, 1862-1937. American Hostels for Refugees (Groslay). Box 56, folder 1655. n.d.. https://collections.library.yale.edu/catalog/2057253.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 56, folder 1655"])(n.d.)[American Hostels for Refugees (Groslay)]. https://collections.library.yale.edu/catalog/2057253.