MLA

Kissinger, Henry, 1923-2023. "Test-Ban Treaty: Let's Wait Awhile," by John Deutch, Brent Scowcroft and Kissinger, Washington Post, Oct 6, 1999. Box 217, folder 24. 1999. https://collections.library.yale.edu/catalog/12481010.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 217, folder 24"])(1999)["Test-Ban Treaty: Let's Wait Awhile," by John Deutch, Brent Scowcroft and Kissinger, Washington Post, Oct 6, 1999]. https://collections.library.yale.edu/catalog/12481010.