sugiarni, rani (2019) “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, 5(2), pp. 83–89. doi: 10.30997/qh.v5i2.1926.