MLA

Kissinger, Henry, 1923-2023. Boston College. Box 9, folder 15. 1967-1968. https://collections.library.yale.edu/catalog/11782438.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 9, folder 15"])(1967-1968)[Boston College]. https://collections.library.yale.edu/catalog/11782438.