MLA

Kissinger, Henry, 1923-2023. Frost, David. Box 424, folder 6. 1979. https://collections.library.yale.edu/catalog/11777637.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 424, folder 6"])(1979)[Frost, David]. https://collections.library.yale.edu/catalog/11777637.