Citazione APA

Guffey, M. E. (1999). Business English (6th ed.). Cincinnati, Ohio: South-Western College.

Stile di citazione Chicago

Guffey, Mary Ellen. Business English. 6th ed. Cincinnati, Ohio: South-Western College, 1999.

Citazione MLA

Guffey, Mary Ellen. Business English. 6th ed. Cincinnati, Ohio: South-Western College, 1999.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.