http://e-repository.perpus.iainsalatiga.ac.id/20100
http://e-repository.perpus.iainsalatiga.ac.id/19262
http://e-repository.perpus.iainsalatiga.ac.id/19641
http://e-repository.perpus.iainsalatiga.ac.id/19693
http://e-repository.perpus.iainsalatiga.ac.id/18097