“PROMOTING STUDENTS’ CONCEPTUAL CHANGE ON THE CONCEPT OF ECOSYSTEM THROUGH PDEODE (PREDICT-DISCUSS-OBSERVE-EXPLAIN-DISCUSS-EXPLAIN) TEACHING STRATEGY ”. 2016. Jurnal Pengajaran Matematika Dan Ilmu Pengetahuan Alam 21 (1): 52-60. https://doi.org/10.18269/jpmipa.v21i1.36257.