MLA

Kissinger, Henry, 1923-2023. Morgenthau, Hans. Box 42, folder 20. 1956-1961. https://collections.library.yale.edu/catalog/11783165.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 42, folder 20"])(1956-1961)[Morgenthau, Hans]. https://collections.library.yale.edu/catalog/11783165.