MLA

Kissinger, Henry, 1923-2023. Galbraith, John Kenneth. Box 23, folder 8. 1952-1969. https://collections.library.yale.edu/catalog/11782732.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 23, folder 8"])(1952-1969)[Galbraith, John Kenneth]. https://collections.library.yale.edu/catalog/11782732.