MLA

Kissinger, Henry, 1923-2023. American Express board of directors. Box 226, folder 18. 2004 September. https://collections.library.yale.edu/catalog/12480516.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 226, folder 18"])(2004 September)[American Express board of directors]. https://collections.library.yale.edu/catalog/12480516.