https://etd.repository.ugm.ac.id/penelitian/detail/537552012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/539782012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/544592012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/546402012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/555022012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/555592012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/561852012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/562412012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/569272012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/569462012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/570132012never1.0https://etd.repository.ugm.ac.id/penelitian/detail/571492012never1.0