?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Astuti&rft.au=Sri+Astuti%2C+Astuti&rft.aulast=Sri+Astuti&rft.atitle=The+Effect+of+Character-Based+Teaching+Flipbook+Media+on+The+Results+of+Calculus+Learning&rft.title=IEEE+XPLORE&rft.genre=article