Manurung, H. M., and S. Manurung. “The Relationship Between Learning Motivation and Learning Outcomes of Students Chemistry of Grade XI-MNS in 4 State SHS Pematangsiantar”. PENDIPA Journal of Science Education, vol. 5, no. 3, June 2021, pp. 466-71, doi:10.33369/pendipa.5.3.466-471.