MLA

Kissinger, Henry, 1923-2023. McBee Systems. Box 105, folder 8. Circa 1966. https://collections.library.yale.edu/catalog/11784206.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 105, folder 8"])(Circa 1966)[McBee Systems]. https://collections.library.yale.edu/catalog/11784206.