Tài liệu tham khảo WikiPedia: Đảo_Dongbaek http://english.visitkorea.or.kr/enu/ATR/SI_EN_3_1_... http://english.visitkorea.or.kr/enu/ATR/SI_EN_3_1_... //tools.wmflabs.org/geohack/geohack.php?language=v...