MLA

Kissinger, Henry, 1923-2023. H. Box 339, folder 12. 1968 November-1969 January. https://collections.library.yale.edu/catalog/11775069.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 339, folder 12"])(1968 November-1969 January)[H]. https://collections.library.yale.edu/catalog/11775069.