Harvard Business Essentials. (2006). Marketer's Toolkit. Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Harvard Business Essentials. Marketer's Toolkit. New Delhi: Cengage Learning, 2006.
Lua MLA (9ú heag.)Harvard Business Essentials. Marketer's Toolkit. Cengage Learning, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.