MLA

Loy, Mina (1882-1966). "Mass Production on 14th Street". Box 5, folder 102. 1942 Jul 27. https://collections.library.yale.edu/catalog/11699615.

APA, 6th edition

Loy, Mina (1882-1966). (["Box 5, folder 102"])(1942 Jul 27)["Mass Production on 14th Street"]. https://collections.library.yale.edu/catalog/11699615.