MLA

Kissinger, Henry, 1923-2023. Kennedy, John F.-correspondence. Box 156, folder 4. 1961. https://collections.library.yale.edu/catalog/12481075.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 156, folder 4"])(1961)[Kennedy, John F.-correspondence]. https://collections.library.yale.edu/catalog/12481075.