https://etd.repository.ugm.ac.id/penelitian/detail/1208572000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1208602000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1208722000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1208772000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1208802000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1208842000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1208872000never1.0