https://etd.repository.ugm.ac.id/penelitian/detail/812482015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/836012015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/840962015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/881712015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/902892015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/903772015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/913392015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/914782015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/923392015never1.0https://etd.repository.ugm.ac.id/penelitian/detail/926942015never1.0