MLA

Kissinger, Henry, 1923-2023. Rocket-Ronald. Box 56, folder 7. 1948. https://collections.library.yale.edu/catalog/12481664.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 56, folder 7"])(1948)[Rocket-Ronald]. https://collections.library.yale.edu/catalog/12481664.