MLA

Kissinger, Henry, 1923-2023. Palmer, Michael. Box 47, folder 8. 1967-1968 January. https://collections.library.yale.edu/catalog/11783260.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 47, folder 8"])(1967-1968 January)[Palmer, Michael]. https://collections.library.yale.edu/catalog/11783260.