^Benjamin Sack (1911-2003) "founded his chain, Sack Theaters, in 1952. By sheer force of personality, he built his holding, transforming theaters such as the Metropolitan and the RKO Keith Memorial and renaming them the Music Hall and the Savoy. His holdings also included the Beacon Hill, Cheri, Music Hall, and Saxon theaters." (Tom Long. "Benjamin Sack, 92, scrap dealer built theater chain." Boston Globe, 06 Apr 2003: B.9)
^Tom Long, "Susan H. Timken, 53; was patron of literary, operatic arts in Boston". Boston Globe, November 14, 1997.
Library of Congress, Historic American Buildings Survey. B. F. Keith Memorial Theatre, 539 Washington Street, Boston, Suffolk County, MA (i.e. Boston Opera House)