Dagnew, G., and A. D. Kelkay. “The Effects of Problem-Solving Teaching Methods on Elementary School student’s Physics Achievement at Dudmegn Full Cycle Elementary School, Ethiopia”. Global Journal of Guidance and Counseling in Schools: Current Perspectives, vol. 10, no. 1, Apr. 2020, pp. 49-63, doi:10.18844/gjgc.v10i1.4653.