https://etd.repository.ugm.ac.id/penelitian/detail/615662013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/615672013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/615942013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/616082013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/616722013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/618342013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/625752013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/638752013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/640052013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/643442013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/668722013never1.0