Zonis, M., & Semler, D. (1992). The East European opportunity: The complete business guide and sourcebook. Wiley.
Lua i Stíl Chicago (17ú heag.)Zonis, Marvin, agus Dwight Semler. The East European Opportunity: The Complete Business Guide and Sourcebook. New York: Wiley, 1992.
Lua MLA (8ú heag.)Zonis, Marvin, agus Dwight Semler. The East European Opportunity: The Complete Business Guide and Sourcebook. Wiley, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.