Kurniasih, D. I., B. Baedhowi, and S. Sudiyanto. “Media E-Book Berbasis Problem Based Learning Dalam Mata Pelajaran Ekonomi”. Surya Edunomics, Vol. 3, no. 1, May 2019, pp. 49-61, https://ebook.umpwr.ac.id/suryaedunomics/article/view/1053.