https://etd.repository.ugm.ac.id/penelitian/detail/574722013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/584952013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/586202013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/588052013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/589412013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/592742013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/593972013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/629492013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/655562013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/665032013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/689622013never1.0