Septiani, Findi, dan Martina Asiati Napitupulu. 2016. “THE EFFECT OF HIGHER ORDER THINKING QUESTION INBIOLOGY PRACTICAL WORKSHEETS TO STUDENTS LEARNING ACHIEVEMENT ON ECOSYSTEM TOPIC GRADE X”. Jurnal Pelita Pendidikan 4 (2). https://doi.org/10.24114/jpp.v4i2.4019.