MLA

Kissinger, Henry, 1923-2023. Bowie, Robert. Box 120, folder 22. 1958 August-1959 October. https://collections.library.yale.edu/catalog/11784458.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 120, folder 22"])(1958 August-1959 October)[Bowie, Robert]. https://collections.library.yale.edu/catalog/11784458.