Ball, D. A., & McCulloch, H. W. (1993). International business: Introduction and essentials (5th ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Ball, Donald A., agus H. Wendell McCulloch. International Business: Introduction and Essentials. 5th ed. Burr Ridge, Ill: Irwin, 1993.
Lua MLA (9ú heag.)Ball, Donald A., agus H. Wendell McCulloch. International Business: Introduction and Essentials. 5th ed. Irwin, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.