Cita APA

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

Citación estilo Chicago

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

Cita MLA

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