MLA

Loy, Mina (1882-1966). "Passivia". Box 5, folder 144. n.d.. https://collections.library.yale.edu/catalog/11700605.

APA, 6th edition

Loy, Mina (1882-1966). (["Box 5, folder 144"])(n.d.)["Passivia"]. https://collections.library.yale.edu/catalog/11700605.