http://e-repository.perpus.iainsalatiga.ac.id/17878
http://e-repository.perpus.iainsalatiga.ac.id/17778
http://e-repository.perpus.iainsalatiga.ac.id/17056
http://e-repository.perpus.iainsalatiga.ac.id/17381
http://e-repository.perpus.iainsalatiga.ac.id/15954