Rossa, Rona. “THE EFFECT OF TEACHING CRITICAL THINKING SKILL THROUGH PROBLEM SOLVING TECHNIQUE TOWARD STUDENTS™ WRITING SKILL IN STKIP ADZKIA PADANG”. JURNAL HANDAYANI PGSD FIP UNIMED, vol. 7, no. 2, Aug. 2017, pp. 22-28, doi:10.24114/jh.v7i2.7232.