sugiarni, rani. “PENERAPAN MEDIA AJAR DIGITAL BERBASIS 4C ( COMMUNICATION, COLLABORATION, CRITICAL THINKING AND PROBLEM SOLVING, DAN CREATIVITY AND INNOVATION) DALAM MENGHADAPI REVOLUSI INDUSTRI 4.0 DI KALANGAN GURU YAYASAN MANDIRI BERSEMI”. Qardhul Hasan: Media Pengabdian Kepada Masyarakat, vol. 5, no. 2, Oct. 2019, pp. 83-89, doi:10.30997/qh.v5i2.1926.