https://etd.repository.ugm.ac.id/penelitian/detail/2554352025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2555382025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2688592025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2688602025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2688612025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2688652025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2688662025never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2688702025never1.0