?url_ver=Z39.88-2004&rft_id=10.17654%2FHMSI118101&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=F.&rft.au=Izzyan%2C+F.&rft.aulast=Izzyan&rft.date=2018&rft.title=JP+Journal+of+Heat+and+Mass+Transfer&rft.atitle=Comparative+study%3A+A+case+study+in+analyzing+gamification+between+MindSnacks+and+Duolingo&rft.pages=101-106&rft.volume=15&rft.issn=09735763&rft.issue=Specia&rft.genre=article