C1-6 olah
http://e-repository.perpus.iainsalatiga.ac.id/18845
http://e-repository.perpus.iainsalatiga.ac.id/18228
http://e-repository.perpus.iainsalatiga.ac.id/18820
http://e-repository.perpus.iainsalatiga.ac.id/18988
http://e-repository.perpus.iainsalatiga.ac.id/19349
c1-2 olah