MLA

Kissinger, Henry, 1923-2023. Unknown author, research papers on Britain, France, Germany, Russia, United States in 1930s. Box 294, folder 18. Circa 1952-circa 1968. https://collections.library.yale.edu/catalog/11787317.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 294, folder 18"])(Circa 1952-circa 1968)[Unknown author, research papers on Britain, France, Germany, Russia, United States in 1930s]. https://collections.library.yale.edu/catalog/11787317.