?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Eko+Prasetyo&rft.aulast=Erwan&rft.au=Erwan%2C+Eko+Prasetyo&rft.degree=S1&rft.date=2012&rft.inst=UNIVERSITAS+NEGERI+YOGYAKARTA&rft.title=LEARNING+MEDIA+OF+SIGNAL+AUDIO+FILTER+FOR+AUDIO+ENGINEERING+SUBJECT