?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Mas'ula+S&rft.aulast=Mas'ula+S&rft.au=Mas'ula+S%2C+Mas'ula+S&rft.title=Designing+of+Active-Iconic-Symbolic+Problem+Based+Learning+Model+(PBM-ENIKSI)+for+Elementary+School&rft.issn=Print%3A+1742-6588+dan+Online%3A+1742-6596&rft.date=March+2019&rft.genre=proceeding