Bull, H. y. (2002). The anarchical society: Study of order in world politics. Palgrave.
Lua i Stíl Chicago (17ú heag.)Bull, Hedle y. The Anarchical Society: Study of Order in World Politics. Basingstoke: Palgrave, 2002.
Lua MLA (9ú heag.)Bull, Hedle y. The Anarchical Society: Study of Order in World Politics. Palgrave, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.