Nasution, Ahmad Bukhari, et al. “Implementation of the Third Principles of Indonesian Unity in Class PPLG 1 SMK PAB 2 Helvetia”. QISTINA: Jurnal Multidisiplin Indonesia, vol. 3, no. 1, June 2024, pp. 771-7, doi:10.57235/qistina.v3i1.2415.