MLA

Kissinger, Henry, 1923-2023. Brennan, Donald G.. Box 9, folder 24. 1960. https://collections.library.yale.edu/catalog/11782447.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 9, folder 24"])(1960)[Brennan, Donald G.]. https://collections.library.yale.edu/catalog/11782447.