Punnett, B. J., & Ricks, D. A. (1992). International business. Pws - Kent Pub. Co..
Lua i Stíl Chicago (17ú heag.)Punnett, Betty Jane, agus David A. Ricks. International Business. Boston: Pws - Kent Pub. Co., 1992.
Lua MLA (9ú heag.)Punnett, Betty Jane, agus David A. Ricks. International Business. Pws - Kent Pub. Co., 1992.
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