Lloyd Gutteridge. (2012). IB Business and Management Study Guide: Oxford IB Diploma Program (Study Guide.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Lloyd Gutteridge. IB Business and Management Study Guide: Oxford IB Diploma Program. Study Guide. Oxford University Press, 2012.
Lua MLA (9ú heag.)Lloyd Gutteridge. IB Business and Management Study Guide: Oxford IB Diploma Program. Study Guide. Oxford University Press, 2012.
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