Astar, Hidayatul. “Vowel Variation of Malay Language in The Land of Riau and The Islands of Riau”. Gramatika: Jurnal Ilmiah Kebahasaan dan Kesastraan 1, no. 2 (December 1, 2013): 93-102. Accessed December 4, 2024. http://gramatika.kemdikbud.go.id/index.php/gramatika/article/view/31.