Bull, H. (1977). The anarchical society: A study of order in world politics. Columbia University.
Citazione stile Chigago Style (17a edizione)Bull, Hedley. The Anarchical Society: A Study of Order in World Politics. Nueva York: Columbia University, 1977.
Citatione MLA (9a ed.)Bull, Hedley. The Anarchical Society: A Study of Order in World Politics. Columbia University, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.