https://etd.repository.ugm.ac.id/penelitian/detail/40142000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/42192000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/42552000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/47042000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/47082000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/47422000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/47972000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2665922000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2671212000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2673452000never1.0