MLA

Kissinger, Henry, 1923-2023. Dahrendorf, Ralf. Box 257, folder 3. 1962-1964. https://collections.library.yale.edu/catalog/11786697.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 257, folder 3"])(1962-1964)[Dahrendorf, Ralf]. https://collections.library.yale.edu/catalog/11786697.