https://etd.repository.ugm.ac.id/penelitian/detail/512722011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/514932011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/523232011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/523542011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/523772011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/524472011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/535322011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/535832011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/535902011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/537682011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/538942011never1.0https://etd.repository.ugm.ac.id/penelitian/detail/540562011never1.0