https://etd.repository.ugm.ac.id/penelitian/detail/678332014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/709292014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/740122014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/740732014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/741912014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/743192014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/744512014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/744522014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/744912014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/750812014never1.0