https://etd.repository.ugm.ac.id/penelitian/detail/418162009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418172009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418182009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418192009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418202009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418222009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418232009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418242009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418252009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/418262009never1.0