Tolong jelaskan mengenai Galeri dari Keystone Studios

Neibaur, James L. (2011); Early Charlie Chaplin: The Artist as Apprentice at Keystone Studios; Lanham, MD: Scarecrow Press; ISBN 978-0-8108-8242-3

Walker, Brent (2009); Mack Sennett's Fun Factory Jefferson, NC: McFarland and Co. ISBN 978-0-7864-3610-1