Rampean, B. A. O., E. . Rohaeti, and W. P. . Utami. “Teacher Difficulties for Develop Higher Order Thinking Skills Assessment Instrument on Reaction Rate”. Jurnal Pendidikan Kimia Indonesia, vol. 6, no. 1, Feb. 2022, pp. 11-19, doi:10.23887/jpk.v6i1.40898.