MLA

Kissinger, Henry, 1923-2023. Schelling, Thomas C., "Cuba, Vietnam and China: Changing Concepts of Warfare". Box 291, folder 11. 1965 October 29. https://collections.library.yale.edu/catalog/11787260.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 291, folder 11"])(1965 October 29)[Schelling, Thomas C., "Cuba, Vietnam and China: Changing Concepts of Warfare"]. https://collections.library.yale.edu/catalog/11787260.