MLA

Kissinger, Henry, 1923-2023. Correspondence. Box 131, folder 8. 1957 April. https://collections.library.yale.edu/catalog/11784655.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 131, folder 8"])(1957 April)[Correspondence]. https://collections.library.yale.edu/catalog/11784655.