University of Oklahoma. Bureau of Business Research. Economic development series. University of Oklahoma, Bureau of Business Research.
Čikaški stil citiranja (17. izdanje)University of Oklahoma. Bureau of Business Research. Economic Development Series. Norman: University of Oklahoma, Bureau of Business Research.
MLA način citiranja (8. izdanje)University of Oklahoma. Bureau of Business Research. Economic Development Series. University of Oklahoma, Bureau of Business Research.
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