?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Kumala%2C+Farida+Nur&rft.aulast=Kumala&rft.aufirst=Farida+Nur&rft.date=22+December+2017&rft.isbn=9786026113467&rft.title=PROBLEM+BASED+LEARNING+(PBL)+AND+GROUP+INVESTIGATION+ON+SCIENCE+THINKING+SKILL&rft.btitle=PROCEEDING%3A+The+4th+Summit+Meeting+International+Conference+on+Education.&rft.tpages=6&rft.genre=bookitem