MLA

Kissinger, Henry, 1923-2023. Speakers-Ruina, Jack. Box 130, folder 25. 1968 February 5. https://collections.library.yale.edu/catalog/11784636.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 130, folder 25"])(1968 February 5)[Speakers-Ruina, Jack]. https://collections.library.yale.edu/catalog/11784636.