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Lua i Stíl Chicago (17ú heag.)Douma, Sytse. Economic Approaches To Organizations Syte Douma And Hein Schreuder. Prentice Hall, 1991.
Lua MLA (8ú heag.)Douma, Sytse. Economic Approaches To Organizations Syte Douma And Hein Schreuder. Prentice Hall, 1991.
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