MLA

Kissinger, Henry, 1923-2023. Blackwill, Robert D.. Box 39, folder 11. 2002 July-October. https://collections.library.yale.edu/catalog/12482262.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 39, folder 11"])(2002 July-October)[Blackwill, Robert D.]. https://collections.library.yale.edu/catalog/12482262.