International Progress Organization, Köchler, H., & Grabher, G. (1999). Civilizations: Conflict or dialogue. International Progress Organization.
Citace podle Chicago (17th ed.)International Progress Organization, Hans Köchler, a Gudrun Grabher. Civilizations: Conflict or Dialogue. Vienna, Austria: International Progress Organization, 1999.
Citace podle MLA (9th ed.)International Progress Organization, et al. Civilizations: Conflict or Dialogue. International Progress Organization, 1999.
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