Swan, M., & Walter, C. (1997). The New Cambridge English Course IV: Upper- Intermediate. New York: Cambridge University Press.
シカゴスタイル引用形Swan, Michael, , Catherine Walter. The New Cambridge English Course IV: Upper- Intermediate. New York: Cambridge University Press, 1997.
MLA引用形式Swan, Michael, , Catherine Walter. The New Cambridge English Course IV: Upper- Intermediate. New York: Cambridge University Press, 1997.
警告: この引用は必ずしも正確ではありません.