MLA

Kissinger, Henry, 1923-2023. Young, Elizabeth and Wayland. Box 65, folder 2. 1968-1969. https://collections.library.yale.edu/catalog/11783661.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 65, folder 2"])(1968-1969)[Young, Elizabeth and Wayland]. https://collections.library.yale.edu/catalog/11783661.