Gaya APA

Ball, P., Kobrak, P. (1999). State violence in Guatemala, 1960-1996 : a quantitative reflection . New York: American Association for the Advancement of Science.

Gaya MLA

Ball, Patrick., Kobrak, Paul. "State violence in Guatemala, 1960-1996 : a quantitative reflection". New York: American Association for the Advancement of Science, 1999. Book.