https://etd.repository.ugm.ac.id/penelitian/detail/418322009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435422009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435512009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435522009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435532009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435542009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435562009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/435572009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/443132009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/443172009never1.0https://etd.repository.ugm.ac.id/penelitian/detail/450712009never1.0