http://e-repository.perpus.iainsalatiga.ac.id/6850/
http://e-repository.perpus.iainsalatiga.ac.id/8634
http://e-repository.perpus.iainsalatiga.ac.id/8701
http://e-repository.perpus.iainsalatiga.ac.id/8815
http://e-repository.perpus.iainsalatiga.ac.id/8627