?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Pristi%2C+Wikan+Wiwahani&rft.aulast=Pristi&rft.aufirst=Wikan+Wiwahani&rft.date=25+December+2015&rft.degree=S1&rft.title=EFEKTIVITAS+METODE+PECS+(PICTURE+EXCHANGE+COMMUNICATION+SYSTEM)+FASE+I-IV+TERHADAP+KEMAMPUAN+KOMUNIKASI+EKSPRESIF+PADA+ANAK+AUTIS+KELAS+1+SDLB+DI+SEKOLAH+LUAR+BIASA+NEGERI+1+BANTUL&rft.inst=Universitas+Negeri+Yogyakarta