MLA

Kissinger, Henry, 1923-2023. Phi Beta Kappa certificate. Box 69, folder 9. 1949. https://collections.library.yale.edu/catalog/11783732.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 69, folder 9"])(1949)[Phi Beta Kappa certificate]. https://collections.library.yale.edu/catalog/11783732.