?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Vievin+Efendy&rft.aulast=71150016&rft.au=71150016%2C+Vievin+Efendy&rft.date=July+2019&rft.inst=Universitas+Kristen+Duta+Wacana&rft.title=IMPLEMETASI+CHAT+ROOM+DAN+PUSH+NOTIFICATION+PADA+E-CLASS+BERBASIS+MOBILE&rft.degree=Bachelor&rft.tpages=115