Firnanda, Irfan. “POLITENESS IN THE SPEECH OF CHARACTER IN ‘KEY EYE by HELLA S. HAASSE’ NOVEL (Content Analysis Methods)”. Bahtera: Jurnal Pendidikan Bahasa Dan Sastra, vol. 17, no. 2, July 2018, pp. 34-45, doi:10.21009/BAHTERA.172.04.