?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aulast=Mas'ula&rft.au=Mas'ula%2C+Siti&rft.aufirst=Siti&rft.title=The+Validity+of+Enactive+Iconic+Symbolic+Problem+Based+Learning+Model+(PBMENI+KSI)+for+Elementary+School&rft.date=2019&rft.issn=2352-5398&rft.genre=proceeding