MLA

Loy, Mina (1882-1966). "Second Costa Visit": draft fragments. Box 1, folder 8. n.d.. https://collections.library.yale.edu/catalog/11134835.

APA, 6th edition

Loy, Mina (1882-1966). (["Box 1, folder 8"])(n.d.)["Second Costa Visit": draft fragments]. https://collections.library.yale.edu/catalog/11134835.