MLA

Toomer, Jean, 1894-1967. Naumburg, Margaret. Box 6, folder 193-97. 1922-33, n.d.. https://collections.library.yale.edu/catalog/16725495.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 6, folder 193-97"])(1922-33, n.d.)[Naumburg, Margaret]. https://collections.library.yale.edu/catalog/16725495.