MLA

Kissinger, Henry, 1923-2023. Ma. Box 620, folder 3. 1999-2000. https://collections.library.yale.edu/catalog/11780338.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 620, folder 3"])(1999-2000)[Ma]. https://collections.library.yale.edu/catalog/11780338.