Purdue Research Foundation & Purdue University. Department of Foreign Languages & Literatures. (1996). Global business languages. Purdue Research Foundation.
Chicago-referens (17:e uppl.)Purdue Research Foundation och Purdue University. Department of Foreign Languages & Literatures. Global Business Languages. West Lafayette, IN: Purdue Research Foundation, 1996.
MLA-referens (9:e uppl.)Purdue Research Foundation och Purdue University. Department of Foreign Languages & Literatures. Global Business Languages. Purdue Research Foundation, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.