MLA

Kissinger, Henry, 1923-2023. Vietnam briefing book. Box 237, folder 7. Circa 1968. https://collections.library.yale.edu/catalog/11786316.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 237, folder 7"])(Circa 1968)[Vietnam briefing book]. https://collections.library.yale.edu/catalog/11786316.