PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE CO-OP CO-OP (CO-OPERATION CO-OPERATIVE) TERHADAP PRESTASI BELAJAR SISWA MATERI POKOK TURUNAN FUNGSI KELAS XI IPS SMAN 1 MASBAGIK - Hamdani, Hamdani (IKIP Mataram, 2013)