Mutaqy, R. M., N. Nasution, and N. H. Purnomo. “Effects of TASC Learning Model (Thinking Actively In A Social Context) on Ability Problem-Solving in Natural Resource Management Materials”. The Indonesian Journal of Social Studies, vol. 2, no. 1, July 2019, pp. 11-20, doi:10.26740/ijss.v2n1.p11-20.