Desmiwati, R., Ratnawulan, R. and Yulkifli, Y. (2017) “Validitas LKPD Fisika SMA Menggunakan Model Problem Based Learning Berbasis Teknologi Digital”, JURNAL EKSAKTA PENDIDIKAN (JEP), 1(1), pp. 33-38. doi: 10.24036/jep/vol1-iss1/31.