MLA

Kissinger, Henry, 1923-2023. Nixon, Richard. Box 361, folder 29. 1975. https://collections.library.yale.edu/catalog/11775416.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 361, folder 29"])(1975)[Nixon, Richard]. https://collections.library.yale.edu/catalog/11775416.