Triani, Pauline Dewi, et al. “The Development of Problem Based Learning Modules of Acid Base Materials in SMA N 5 Jambi in Developing Student Metacognitive Skills”. Jurnal Pendidikan Kimia, vol. 9, no. 1, Apr. 2017, pp. 286-92, doi:10.24114/jpkim.v9i1.6204.