MLA

Kissinger, Henry, 1923-2023. 40th anniversary of the Federal Republic of Germany, Kennedy Center, May 31, 1989. Box 712, folder 6. 1989. https://collections.library.yale.edu/catalog/11781623.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 712, folder 6"])(1989)[40th anniversary of the Federal Republic of Germany, Kennedy Center, May 31, 1989]. https://collections.library.yale.edu/catalog/11781623.