MLA

Kissinger, Henry, 1923-2023. Stehlin, Paul. Box 56, folder 17. 1965-1968. https://collections.library.yale.edu/catalog/11783473.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 56, folder 17"])(1965-1968)[Stehlin, Paul]. https://collections.library.yale.edu/catalog/11783473.