Although some advertising agencies, and book, magazine, and newspaper publishers have their own bindery operations, employing some bookbinders and bindery workers, the majority of jobs are in commercial printing plants. The largest employers of bindery workers are bindery trade shops— these companies specialize in providing binding services for printers without binderies or whose printing production exceeds their binding capabilities. Few publishers maintain their own manufacturing facilities, so most contract out the printing and assembly of books to commercial printing plants or bindery trade shops.