Kumala, Farida Nur and Lee, Sony Cornelis  (2017) PROBLEM BASED LEARNING (PBL) AND GROUP INVESTIGATION ON SCIENCE THINKING SKILL.   In:  PROCEEDING: The 4th Summit Meeting International Conference on Education.   Prosiding, -  (-).  PGMI PRESS UIN SUKA, Yogyakarta, pp. 43-48.  ISBN 9786026113467