MLA

Kissinger, Henry, 1923-2023. Lenin, Vladimir quote. Box 221, folder 5. 1967 February. https://collections.library.yale.edu/catalog/11786121.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 221, folder 5"])(1967 February)[Lenin, Vladimir quote]. https://collections.library.yale.edu/catalog/11786121.