MLA

Kagan, Paul, 1943-1993. "A Man Must Fight," typescript, corrected. Box 2, folder 69. n.d.. https://collections.library.yale.edu/catalog/17157278.

APA, 6th edition

Kagan, Paul, 1943-1993. (["Box 2, folder 69"])(n.d.)["A Man Must Fight," typescript, corrected]. https://collections.library.yale.edu/catalog/17157278.