MLA

Kissinger, Henry, 1923-2023. Chapter IV [part manuscript]. Box 268, folder 3. Circa 1964. https://collections.library.yale.edu/catalog/11786827.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 268, folder 3"])(Circa 1964)[Chapter IV [part manuscript]]. https://collections.library.yale.edu/catalog/11786827.