MLA

Kissinger, Henry, 1923-2023. Johnson, Joseph. Box 199, folder 27. 1968 February-June. https://collections.library.yale.edu/catalog/11785846.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 199, folder 27"])(1968 February-June)[Johnson, Joseph]. https://collections.library.yale.edu/catalog/11785846.