https://etd.repository.ugm.ac.id/penelitian/detail/1792992019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1793092019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1800222019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1801262019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1801272019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1801292019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1801302019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1801402019never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1823032019never1.0