https://etd.repository.ugm.ac.id/penelitian/detail/2302222026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2708672026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2726082026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2730802026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2735722026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2736142026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2736362026never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2736532026never1.0