Snapshots
MLA
Zilboorg, Gregory, 1890-1959. Snapshots. Box 7, folder 90. undated. https://collections.library.yale.edu/catalog/16470627.
APA, 6th edition
Zilboorg, Gregory, 1890-1959. (["Box 7, folder 90"])(undated)[Snapshots]. https://collections.library.yale.edu/catalog/16470627.