?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Dewanti+Ratna&rft.aulast=Pertiwi&rft.au=Pertiwi%2C+Dewanti+Ratna&rft.degree=S1&rft.date=10+June+2011&rft.title=DEVELOPING+INTERACTIVE+LEARNING+MULTIMEDIA+OF+%E2%80%98EFFECTIVE+COMMUNICATION%E2%80%99+ENGLISH+TEXTBOOK+FOR+THE+ELEMENTARY+LEVEL+STUDENTS+OF+SMK+MUHAMMADIYAH+1+WONOSARI%2C+GUNUNGKIDUL&rft.inst=Universitas+Negeri+Yogyakarta