Afriani, Susi Herti. “THE REALIZATION OF POLITENESS STRATEGIES IN ENGLISH DIRECTIVES AMONG MEMBERS OF PALEMBANGNESE ETHNIC GROUPS IN PALEMBANG, SOUTH SUMATRA, INDONESIA: TEACHING JOURNEY”. Istinbath, vol. 15, no. 1, Sept. 2016, pp. 141-54, https://jurnal.radenfatah.ac.id/index.php/istinbath/article/view/782.