MLA

Kissinger, Henry, 1923-2023. Sl. Box 145, folder 11. 2007. https://collections.library.yale.edu/catalog/12480080.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 145, folder 11"])(2007)[Sl]. https://collections.library.yale.edu/catalog/12480080.