Volume I:
MLA
Harkness, Mary Emma Stillman, 1874-1950. Volume I:. Box 1, folder 1. 1730-1812. https://collections.library.yale.edu/catalog/2064623.
APA, 6th edition
Harkness, Mary Emma Stillman, 1874-1950. (["Box 1, folder 1"])(1730-1812)[Volume I:]. https://collections.library.yale.edu/catalog/2064623.