MLA

Kissinger, Henry, 1923-2023. St. Box 580, folder 1. 1990. https://collections.library.yale.edu/catalog/11779802.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 580, folder 1"])(1990)[St]. https://collections.library.yale.edu/catalog/11779802.