http://e-repository.perpus.iainsalatiga.ac.id/19125
http://e-repository.perpus.iainsalatiga.ac.id/19505
http://e-repository.perpus.iainsalatiga.ac.id/19028
http://e-repository.perpus.iainsalatiga.ac.id/19499
http://e-repository.perpus.iainsalatiga.ac.id/18256