BAREKTOKAN R., CAROLINNANDA. “THE IMPLEMENTATION OF TEACHING SPEAKING BY USING ROLE PLAY ACTIVITY ON THE ELEVENTH GRADERS OF SMAK SANTA AGNES SURABAYA”. RETAIN : Journal of Research in English Language Teaching, vol. 2, no. 3, Jan. 2015, https://ejournal.unesa.ac.id/index.php/retain/article/view/10298.