http://e-repository.perpus.iainsalatiga.ac.id/18888
http://e-repository.perpus.iainsalatiga.ac.id/18212
http://e-repository.perpus.iainsalatiga.ac.id/17687
http://e-repository.perpus.iainsalatiga.ac.id/16180
http://e-repository.perpus.iainsalatiga.ac.id/15506
c.1 olah