MLA

Kissinger, Henry, 1923-2023. E. Box 514, folder 2. 1989-1991. https://collections.library.yale.edu/catalog/11778807.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 514, folder 2"])(1989-1991)[E]. https://collections.library.yale.edu/catalog/11778807.