https://etd.repository.ugm.ac.id/penelitian/detail/2216542023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2219102023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2219562023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2221232023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2223762023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2225382023never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2243162023never1.0