https://etd.repository.ugm.ac.id/penelitian/detail/2217762023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2219392023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2220452023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2224862023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2225152023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2225332023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2225692023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2226042023never1.0