MLA

Kissinger, Henry, 1923-2023. Gas-Gay. Box 44, folder 10. 2002. https://collections.library.yale.edu/catalog/12481544.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 44, folder 10"])(2002)[Gas-Gay]. https://collections.library.yale.edu/catalog/12481544.