MLA

Kissinger, Henry, 1923-2023. All. Box 303, folder 18. 1970-1971. https://collections.library.yale.edu/catalog/11774551.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 303, folder 18"])(1970-1971)[All]. https://collections.library.yale.edu/catalog/11774551.