MLA

Kissinger, Henry, 1923-2023. Mar. Box 427, folder 9. 1979. https://collections.library.yale.edu/catalog/11777679.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 427, folder 9"])(1979)[Mar]. https://collections.library.yale.edu/catalog/11777679.