https://etd.repository.ugm.ac.id/penelitian/detail/130712000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137082000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137122000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137132000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137212000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154502000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154562000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155242000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/156732000never1.0