Prasetya, B. “DIFFERENT LEVEL OF LEARNED-HELPLESSNESS AMONG HIGH SCHOOL STUDENTS WITH LOWER GRADE AND HIGHER GRADE IN SALATIGA INDONESIA”. Satya Widya, Vol. 29, no. 1, June 2013, pp. 15-22, doi:https://doi.org/10.24246/j.sw.2013.v29.i1.p15-22.