http://e-repository.perpus.iainsalatiga.ac.id/18752
http://e-repository.perpus.iainsalatiga.ac.id/18409
http://e-repository.perpus.iainsalatiga.ac.id/17503
http://e-repository.perpus.iainsalatiga.ac.id/17845
http://e-repository.perpus.iainsalatiga.ac.id/15379