ROSYID MAZIDAH, ABD. and Dr. Ahmad Idris Asmaradhani , M.Pd. and Drs. H. Wijayadi,, M.Pd. (2013) REGISTER USED BY OPERATORS IN PRODUCTION DEPARTMENT PT. CHAROEN POKPHAND INDONESIA FEEDMILL KRIAN. Other thesis, Universitas Muhammadiyah Surabaya.