MLA

Kissinger, Henry, 1923-2023. Campbell, John C., "Yugoslavia, Southeastern Europe and United States Policy" (B-4). Box 162, folder 29. Circa 1959-circa 1960. https://collections.library.yale.edu/catalog/11785250.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 162, folder 29"])(Circa 1959-circa 1960)[Campbell, John C., "Yugoslavia, Southeastern Europe and United States Policy" (B-4)]. https://collections.library.yale.edu/catalog/11785250.