Husen, Abu, Indriwati, Sri, AND Lestari, Umie. " PENGEMBANGAN PERANGKAT PEMBELAJARAN BIOLOGI BERBASIS PROBLEM BASED LEARNING DIPADU THINK PAIR SHARE UNTUK MENINGKATKAN KETERAMPILAN PROSES SAINS" BIOEDUKASI [Online], Volume 15 Number 1 (15 April 2017)