MLA

Kissinger, Henry, 1923-2023. "Germany, Neutrality and the 'Security System' Trap," Washington Post, Apr 15, 1990. Box 215, folder 6. 1990. https://collections.library.yale.edu/catalog/12482071.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 215, folder 6"])(1990)["Germany, Neutrality and the 'Security System' Trap," Washington Post, Apr 15, 1990]. https://collections.library.yale.edu/catalog/12482071.