https://etd.repository.ugm.ac.id/penelitian/detail/592022013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592032013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592042013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592052013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592062013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592072013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592082013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592092013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592102013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/781432013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/781472013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/781482013never1.0