Schaffer, R., Agusti, F., & Earle, B. (1999). International business law and its environment (4th ed.). West Educational Pub. Co.
Lua i Stíl Chicago (17ú heag.)Schaffer, Richard, Filiberto Agusti, agus Beverley Earle. International Business Law and Its Environment. 4th ed. Cincinnati, Ohio: West Educational Pub. Co, 1999.
Lua MLA (9ú heag.)Schaffer, Richard, et al. International Business Law and Its Environment. 4th ed. West Educational Pub. Co, 1999.
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