MLA

Kissinger, Henry, 1923-2023. Ruebhausen, Oscar. Box 151, folder 15. 1956 June-1962 October. https://collections.library.yale.edu/catalog/11785018.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 151, folder 15"])(1956 June-1962 October)[Ruebhausen, Oscar]. https://collections.library.yale.edu/catalog/11785018.