Kurniasih, Deka Intan, Baedhowi Baedhowi, and Sudiyanto Sudiyanto. 2019. “Media E-Book Berbasis Problem Based Learning Dalam Mata Pelajaran Ekonomi”. Surya Edunomics 3 (1), 49-61. https://jurnal.umpwr.ac.id/suryaedunomics/article/view/1053.