Gultom, S. (2017). The Effect of Problem Based Learning Strategic and Divergent Thinking Style on The Ability to Solve Environmental The Problems (an Experimental Study at SMP Negeri 161 Jakarta, 2015). IJEEM - Indonesian Journal of Environmental Education and Management, 1(2), 66 - 82. Retrieved from http://103.8.12.212:33180/unj/index.php/ijeem/article/view/3701