MLA

Kissinger, Henry, 1923-2023. Correspondence. Box 258, folder 6. 1966 August-October. https://collections.library.yale.edu/catalog/11786713.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 258, folder 6"])(1966 August-October)[Correspondence]. https://collections.library.yale.edu/catalog/11786713.