Marc Helgesen. (1998). Office File (Student book). Essex, England: longman.
シカゴスタイル引用形Marc Helgesen. Office File (Student Book). Essex, England: longman, 1998.
MLA引用形式Marc Helgesen. Office File (Student Book). Essex, England: longman, 1998.
警告: この引用は必ずしも正確ではありません.