MLA

Kissinger, Henry, 1923-2023. Alperovitz, Gar. Box 2, folder 7. 1962-1963. https://collections.library.yale.edu/catalog/11782306.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 2, folder 7"])(1962-1963)[Alperovitz, Gar]. https://collections.library.yale.edu/catalog/11782306.