MLA

Kissinger, Henry, 1923-2023. Economics class notes. Box 73, folder 7. Circa 1950-circa 1951. https://collections.library.yale.edu/catalog/11783797.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 73, folder 7"])(Circa 1950-circa 1951)[Economics class notes]. https://collections.library.yale.edu/catalog/11783797.