Guffey, M. E. (1999). Business English (6th ed.). Cincinnati, Ohio: South-Western College.
シカゴスタイル引用形Guffey, Mary Ellen. Business English. 6th ed. Cincinnati, Ohio: South-Western College, 1999.
MLA引用形式Guffey, Mary Ellen. Business English. 6th ed. Cincinnati, Ohio: South-Western College, 1999.
警告: この引用は必ずしも正確ではありません.