MLA

Kissinger, Henry, 1923-2023. Blackwill, Robert D.. Box 39, folder 8. 2002 January-May. https://collections.library.yale.edu/catalog/12482258.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 39, folder 8"])(2002 January-May)[Blackwill, Robert D.]. https://collections.library.yale.edu/catalog/12482258.