MLA

Kissinger, Henry, 1923-2023. Strausz-Hupé, Robert. Box 303, folder 6. 1968-1969. https://collections.library.yale.edu/catalog/11774538.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 303, folder 6"])(1968-1969)[Strausz-Hupé, Robert]. https://collections.library.yale.edu/catalog/11774538.