http://e-repository.perpus.iainsalatiga.ac.id/16121
http://e-repository.perpus.iainsalatiga.ac.id/16240
http://e-repository.perpus.iainsalatiga.ac.id/11401
http://e-repository.perpus.iainsalatiga.ac.id/11400
http://e-repository.perpus.iainsalatiga.ac.id/10633