MLA

Vance, Cyrus R. (Cyrus Roberts), 1917-2002. J. F. Kennedy's letter appointing Cyrus R.Vance and Vance's response. Box 7, folder 78. 1962. https://collections.library.yale.edu/catalog/10012721.

APA, 6th edition

Vance, Cyrus R. (Cyrus Roberts), 1917-2002. (["Box 7, folder 78"])(1962)[J. F. Kennedy's letter appointing Cyrus R.Vance and Vance's response]. https://collections.library.yale.edu/catalog/10012721.