MLA

Kissinger, Henry, 1923-2023. British exchanges. Box 347, folder 7. 1973-1974. https://collections.library.yale.edu/catalog/11775203.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 347, folder 7"])(1973-1974)[British exchanges]. https://collections.library.yale.edu/catalog/11775203.