https://etd.repository.ugm.ac.id/penelitian/detail/366842008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/366852008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/366892008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/366942008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/367042008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/367062008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/367072008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/367132008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/367162008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/367182008never1.0