MLA

Kissinger, Henry, 1923-2023. Memoranda, schedules and notices. Box 119, folder 6. 1959-1962 April. https://collections.library.yale.edu/catalog/11784421.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 119, folder 6"])(1959-1962 April)[Memoranda, schedules and notices]. https://collections.library.yale.edu/catalog/11784421.