MLA

Kissinger, Henry, 1923-2023. Renfield, Richard. Box 201, folder 9. 1968 January-March. https://collections.library.yale.edu/catalog/11785879.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 201, folder 9"])(1968 January-March)[Renfield, Richard]. https://collections.library.yale.edu/catalog/11785879.