Triwoelandari, Retno, and Afiyanti Fadilah. 2015. “PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEADS TOGETHER (NHT) TERHADAP TANGGUNG JAWAB DAN KERJA KERAS SISWA”. AT-TA`DIB 1 (1):33-50. http://150.107.142.43/index.php/at-tadib/article/view/132.