?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Herri&rft.au=Mulyono%2C+Herri&rft.aulast=Mulyono&rft.volume=58&rft.date=2019&rft.title=PASAA&rft.pages=295-318&rft.atitle=Politeness+Strategies+in+Teacher-Student+WhatsApp+Communication&rft.genre=article