https://etd.repository.ugm.ac.id/penelitian/detail/1964072021never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1966872021never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1968002021never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1969862021never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1974522021never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2039852021never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2066582021never1.0