MLA

Kissinger, Henry, 1923-2023. Blackwill, Robert D.. Box 39, folder 9. 2002 June 3-6. https://collections.library.yale.edu/catalog/12482260.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 39, folder 9"])(2002 June 3-6)[Blackwill, Robert D.]. https://collections.library.yale.edu/catalog/12482260.