https://etd.repository.ugm.ac.id/penelitian/detail/615722013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/616162013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/616292013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/638592013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/643502013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/644322013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/661682013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/666552013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/667852013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/669852013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/671132013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/671432013never1.0