MLA

Kissinger, Henry, 1923-2023. Lima. Box 228, folder 21. 1973 February 18. https://collections.library.yale.edu/catalog/12480829.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 228, folder 21"])(1973 February 18)[Lima]. https://collections.library.yale.edu/catalog/12480829.