https://etd.repository.ugm.ac.id/penelitian/detail/584592013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592612013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/598072013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/598862013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/600462013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/606942013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/610072013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/628712013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/629802013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/637302013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/638822013never1.0