MLA

Kuh, Katharine, 1904-1994. Lye, Len. Box 1, folder 19. 1961-64. https://collections.library.yale.edu/catalog/17059901.

APA, 6th edition

Kuh, Katharine, 1904-1994. (["Box 1, folder 19"])(1961-64)[Lye, Len]. https://collections.library.yale.edu/catalog/17059901.