?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=0613024051%2C+UMMU+KHOIRIYAH&rft.aulast=0613024051&rft.aufirst=UMMU+KHOIRIYAH&rft.date=16+Nopember+2012&rft.atitle=EFEKTIVITAS+PENERAPAN+MODEL+PROBLEM+BASED+LEARNING+(PBL)+TERHADAP+PENINGKATAN+KETERAMPILAN+PROSES+SAINS+SISWA+&rft.title=Digital+Library&rft.genre=article