http://e-repository.perpus.iainsalatiga.ac.id/7862/
http://e-repository.perpus.iainsalatiga.ac.id/8522
http://e-repository.perpus.iainsalatiga.ac.id/8391
http://e-repository.perpus.iainsalatiga.ac.id/8657
http://e-repository.perpus.iainsalatiga.ac.id/8364