Cita APA (7th ed.)

International Progress Organization, Köchler, H., & Grabher, G. (1999). Civilizations: Conflict or dialogue. International Progress Organization.

Cita Chicago (17th ed.)

International Progress Organization, Hans Köchler, i Gudrun Grabher. Civilizations: Conflict or Dialogue. Vienna, Austria: International Progress Organization, 1999.

Cita MLA (9th ed.)

International Progress Organization, et al. Civilizations: Conflict or Dialogue. International Progress Organization, 1999.