MLA

Kissinger, Henry, 1923-2023. Unidentified. Box 340, folder 7. 1968 December-1969 January. https://collections.library.yale.edu/catalog/11775077.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 340, folder 7"])(1968 December-1969 January)[Unidentified]. https://collections.library.yale.edu/catalog/11775077.