Firsten, R. (2004). Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST.
シカゴスタイル引用形Firsten, Richard. Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST, 2004.
MLA引用形式Firsten, Richard. Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST, 2004.
警告: この引用は必ずしも正確ではありません.