Purdue Research Foundation & Purdue University. Department of Foreign Languages & Literatures. (1996). Global business languages. Purdue Research Foundation.
Cita Chicago (17th ed.)Purdue Research Foundation i Purdue University. Department of Foreign Languages & Literatures. Global Business Languages. West Lafayette, IN: Purdue Research Foundation, 1996.
Cita MLA (9th ed.)Purdue Research Foundation i Purdue University. Department of Foreign Languages & Literatures. Global Business Languages. Purdue Research Foundation, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.