Wahyuning Prastya, I., R. Soe’oed, and I. Setiawan. “THE CORRELATION BETWEEN CRITICAL THINKING SKILL AND WRITING ARGUMENTATIVE ESSAY ACHIEVEMENT”. BASTRA : Jurnal Penelitian Pendidikan Bahasa Dan Sastra, vol. 1, no. 2, Dec. 2014, pp. 191-00, http://cebastra.org/ojs/index.php/BASTRA/article/view/31.