MLA

Kissinger, Henry, 1923-2023. Polish-German-American Forum for Security, Warsaw. Box 782, folder 5. 1997-1998. https://collections.library.yale.edu/catalog/11776970.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 782, folder 5"])(1997-1998)[Polish-German-American Forum for Security, Warsaw]. https://collections.library.yale.edu/catalog/11776970.