Rahim , Nor Aini, and Al Amin Mydin. “Kesahan Kandungan Instrumen Kompetensi Pengajaran Guru Abad   Ke-21: Penilaian Kritis Menggunakan Content Validity Index (CVI)”. EDUCATUM Journal of Social Sciences, vol. 12, no. Special Issue 2, Apr. 2026, pp. 180-91, https://doi.org/10.37134/ejoss.vol12.sp2.16.2026.