c1. olah
http://e-repository.perpus.iainsalatiga.ac.id/8625
http://e-repository.perpus.iainsalatiga.ac.id/8563
http://e-repository.perpus.iainsalatiga.ac.id/11319
http://e-repository.perpus.iainsalatiga.ac.id/11401
http://e-repository.perpus.iainsalatiga.ac.id/11438