https://etd.repository.ugm.ac.id/penelitian/detail/603662013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/610312013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/638692013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/638712013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/639222013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/659312013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/661292013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/665142013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/665492013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/667112013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/667122013never1.0