?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Rudy&rft.au=Gunawan%2C+Rudy&rft.aulast=Gunawan&rft.title=Proceedings+of+the+International+Conference+On+Social+Studies%2C+Globalisation+And+Technology+(ICSSGT+2019)&rft.atitle=Student+Perceptions+of+Social+Studies+Learning+Problems+in+the+Era+4.0+and+the+Way+to+Solve+Them&rft.genre=article