MLA

Kissinger, Henry, 1923-2023. German History II and III. Box 115, folder 20. 1949-1950. https://collections.library.yale.edu/catalog/11784348.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 115, folder 20"])(1949-1950)[German History II and III]. https://collections.library.yale.edu/catalog/11784348.