http://e-repository.perpus.iainsalatiga.ac.id/20100
http://e-repository.perpus.iainsalatiga.ac.id/19641
http://e-repository.perpus.iainsalatiga.ac.id/19257
http://e-repository.perpus.iainsalatiga.ac.id/19182
http://e-repository.perpus.iainsalatiga.ac.id/17916