Ellis, M., O'Driscoll, N., & Pilbeam, A. (1992). Professional English: Communication skills for professionals working in business, industry and internat. organisations (1. publ., 7. impr.). Longman.
Chicago-Zitierstil (17. Ausg.)Ellis, Mark, Nina O'Driscoll, und Adrian Pilbeam. Professional English: Communication Skills for Professionals Working in Business, Industry and Internat. Organisations. 1. publ., 7. impr. Harlow, Essex: Longman, 1992.
MLA-Zitierstil (9. Ausg.)Ellis, Mark, et al. Professional English: Communication Skills for Professionals Working in Business, Industry and Internat. Organisations. 1. publ., 7. impr. Longman, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.