https://etd.repository.ugm.ac.id/penelitian/detail/2106562013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2110012013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2110202013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2110442013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2111722013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2112172013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2112412013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2160842013never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2209632013never1.0