c3 di k2
http://e-repository.perpus.iainsalatiga.ac.id/9255
http://e-repository.perpus.iainsalatiga.ac.id/10437
http://e-repository.perpus.iainsalatiga.ac.id/10375
http://e-repository.perpus.iainsalatiga.ac.id/10445
http://e-repository.perpus.iainsalatiga.ac.id/10500