MLA

Kissinger, Henry, 1923-2023. China trip, Peking University. Box 226, folder 24. 2005. https://collections.library.yale.edu/catalog/12480600.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 226, folder 24"])(2005)[China trip, Peking University]. https://collections.library.yale.edu/catalog/12480600.