Không rõ. (2009). New TOEIC 4n4: Four weeks for weakness.520 level. TH.HCM.
シカゴスタイル引用形Không rõ. New TOEIC 4n4: Four Weeks for Weakness.520 Level. TH.HCM, 2009.
MLA引用形式Không rõ. New TOEIC 4n4: Four Weeks for Weakness.520 Level. TH.HCM, 2009.
警告: この引用は必ずしも正確ではありません.