MLA

Kissinger, Henry, 1923-2023. Alastair Buchan lecture notes. Box 84, folder 2. 1968 April. https://collections.library.yale.edu/catalog/11783895.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 84, folder 2"])(1968 April)[Alastair Buchan lecture notes]. https://collections.library.yale.edu/catalog/11783895.