MLA

Kissinger, Henry, 1923-2023. Do-Du. Box 538, folder 4. 1998. https://collections.library.yale.edu/catalog/11779218.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 538, folder 4"])(1998)[Do-Du]. https://collections.library.yale.edu/catalog/11779218.