Selly, A. . (2022) “ TRAINING TO IMPROVE THE COMPETENCE OF 21ST CENTURY TEACHERS WITH A TECNOLOGICAL PEDAGOGICAL AND CONTENT KNOWLEDGE (TPACK) APPROACH THROUGH THE GOOGLE SITES APPLICATION AND MENTIMTER FOR CHRISTIAN HIGH SCHOOL TEACHERS 2 KALABAHI: PELATIHAN PENINGKATAN KOMPETENSI GURU ABAD 21 DENGAN PENDEKATAN TECNOLOGICAL PEDAGOGICAL AND CONTENT CNOWLEDGE (TPACK) MELALUI APLIKASI SITES GOOGLE DAN MENTIMTER BAGI GURU SMA KRISTEN 2 KALABAHI”, Indonesian Journal of Engagement, Community Services, Empowerment and Development, 2(2), pp. 200–209. doi: 10.53067/ijecsed.v2i2.59.