https://etd.repository.ugm.ac.id/penelitian/detail/376242008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/376252008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/376262008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/376272008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/400562008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/400592008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/400602008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/400612008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/400622008never1.0https://etd.repository.ugm.ac.id/penelitian/detail/402122008never1.0