Ball, D. A. (1990). Instructor's manual to accompany international business (4th ed.). Homewood.
Chicago-čujuhus (17. p.)Ball, Donald A. Instructor's Manual to Accompany International Business. 4th ed. Boston: Homewood, 1990.
MLA-čujuhus (9. p.)Ball, Donald A. Instructor's Manual to Accompany International Business. 4th ed. Homewood, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.