MLA

Kissinger, Henry, 1923-2023. Kissinger family. Box 222, folder 2. 1938 August 28. https://collections.library.yale.edu/catalog/12482103.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 222, folder 2"])(1938 August 28)[Kissinger family]. https://collections.library.yale.edu/catalog/12482103.