MLA

Kissinger, Henry, 1923-2023. Brzezinski, Zbigniew. Box 161, folder 3. 1959-1960 February. https://collections.library.yale.edu/catalog/11785192.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 161, folder 3"])(1959-1960 February)[Brzezinski, Zbigniew]. https://collections.library.yale.edu/catalog/11785192.