MLA

Kissinger, Henry, 1923-2023. Memorandum. Box 140, folder 13. 1957 August 29. https://collections.library.yale.edu/catalog/11784824.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 140, folder 13"])(1957 August 29)[Memorandum]. https://collections.library.yale.edu/catalog/11784824.