MLA

Kissinger, Henry, 1923-2023. Dominican Republic Seminar. Box 124, folder 15. 1967 April. https://collections.library.yale.edu/catalog/11784519.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 124, folder 15"])(1967 April)[Dominican Republic Seminar]. https://collections.library.yale.edu/catalog/11784519.