MLA

Kissinger, Henry, 1923-2023. The European Community. Box 216, folder 6. 1968 May-June. https://collections.library.yale.edu/catalog/11786062.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 216, folder 6"])(1968 May-June)[The European Community]. https://collections.library.yale.edu/catalog/11786062.