Cita APA (7th ed.)
ebrary, Inc, Alderson, K., & Hurrell, A. (2000). Hedley Bull on international society. Macmillan.
Cita Chicago (17th ed.)
ebrary, Inc, Kai Alderson, i Andrew Hurrell. Hedley Bull on International Society. Basingstoke: Macmillan, 2000.
Cita MLA (9th ed.)
ebrary, Inc, et al. Hedley Bull on International Society. Macmillan, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.