Gershon, S. (2002). English upgrade: Student book. Oxford: MacMillan.
シカゴスタイル引用形Gershon, Steven. English Upgrade: Student Book. Oxford: MacMillan, 2002.
MLA引用形式Gershon, Steven. English Upgrade: Student Book. Oxford: MacMillan, 2002.
警告: この引用は必ずしも正確ではありません.