MLA

Kissinger, Henry, 1923-2023. Radio Free Europe. Box 50, folder 4. 1965. https://collections.library.yale.edu/catalog/11783319.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 50, folder 4"])(1965)[Radio Free Europe]. https://collections.library.yale.edu/catalog/11783319.