https://etd.repository.ugm.ac.id/penelitian/detail/38582000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/39672000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/40262000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/44002000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/44042000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/44422000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/45592000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/46442000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/48752000never1.0