https://etd.repository.ugm.ac.id/penelitian/detail/2322592023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2327692023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2327732023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2327842023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2327872023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2327912023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2484252023never1.0