MLA

Kissinger, Henry, 1923-2023. Memoranda for General [William?] Riley. Box 116, folder 15. Circa 1947-circa 1956. https://collections.library.yale.edu/catalog/11784365.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 116, folder 15"])(Circa 1947-circa 1956)[Memoranda for General [William?] Riley]. https://collections.library.yale.edu/catalog/11784365.