MLA

Kissinger, Henry, 1923-2023. Harper and Brothers. Box 28, folder 2. 1961 May-December. https://collections.library.yale.edu/catalog/11782827.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 28, folder 2"])(1961 May-December)[Harper and Brothers]. https://collections.library.yale.edu/catalog/11782827.