Nainggolan, Bajoka, Ita Sri Apika Pinem, and Wesly Hutabarat. “Development of Chemical Practice Guides Class Xi Project Based to Improve student™s Chemical Learning Outcomes on Acid Base Materials”. Jurnal Pendidikan Kimia 10, no. 2 (August 30, 2018): 393–396. Accessed June 9, 2025. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/11018.