Schaffer, R., Earle, B., & Agusti, F. (2002). International business law and its environment (5th ed.). West/Thomson Learning.
Lua i Stíl Chicago (17ú heag.)Schaffer, Richard, Beverley Earle, agus Filiberto Agusti. International Business Law and Its Environment. 5th ed. Cincinnati, Ohio: West/Thomson Learning, 2002.
Lua MLA (8ú heag.)Schaffer, Richard, et al. International Business Law and Its Environment. 5th ed. West/Thomson Learning, 2002.
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