Maya, C.A. et al. 2017. DEVELOPMENT OF SETS-BASED WITH OUTDOOR LEARNING-METHOD Of STUDENT WORKSHEET TO ADVANCE ENVIRONMENTAL SCIENCE PROCESS SKILL AND ATTITUDE IN A VIIth GRADE HIGH SCHOOL STUDENTS. Journal of Science Education Research. 1, 1 (Oct. 2017). DOI:https://doi.org/10.21831/jser.v1i1.16176.