MLA

Kissinger, Henry, 1923-2023. English-Speaking Union of the United States, America and Britain: Problems of Politics, Defense, Economics. Box 286, folder 17. 1961. https://collections.library.yale.edu/catalog/11787148.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 286, folder 17"])(1961)[English-Speaking Union of the United States, America and Britain: Problems of Politics, Defense, Economics]. https://collections.library.yale.edu/catalog/11787148.