MLA

Kissinger, Henry, 1923-2023. Buchan, Alastair. Box 361, folder 10. 1971. https://collections.library.yale.edu/catalog/11775397.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 361, folder 10"])(1971)[Buchan, Alastair]. https://collections.library.yale.edu/catalog/11775397.