https://etd.repository.ugm.ac.id/penelitian/detail/1354292002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1354472002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1385892002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1395272002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1414892002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1417792002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1425892002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1427572002never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1429242002never1.0