https://etd.repository.ugm.ac.id/penelitian/detail/770862014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/771322014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/775122014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/775402014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/777092014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/777632014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/777682014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/777692014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/777852014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/778382014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/780302014never1.0https://etd.repository.ugm.ac.id/penelitian/detail/780312014never1.0