MLA

Kissinger, Henry, 1923-2023. Altschul, Frank. Box 2, folder 11. 1962-1968. https://collections.library.yale.edu/catalog/11782310.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 2, folder 11"])(1962-1968)[Altschul, Frank]. https://collections.library.yale.edu/catalog/11782310.